Typed states for the displayed outbound observations.
Source: paper_references, paper_reference_links, observed 2026-08-16T12:02:40.340938Z
Paper Citation Record · LEDGER
As of 19 August 2026, this Paper Citation Record lists 65 of 65 outbound references and 0 inbound Pith citation observations for arXiv:2504.14017.
A citation records a reference. It does not transfer a finding from one paper to another.
Typed states for the displayed outbound observations.
Source: paper_references, paper_reference_links, observed 2026-08-16T12:02:40.340938Z
One-hop event checks from named stored sources.
Source: scholarly_work_events, retraction_status_cache, observed 2026-08-19T06:32:44.657259+00:00
Pith citing papers itemized under the disclosed page cap.
Source: paper_references, paper_reference_links
A source-named dated measurement, never combined with another source.
Source: cited_works
65 of 65 outbound references displayed
External citation measurements
No source-named external measurement is stored.
Observation 03a9959c-fc66-43ab-b617-e6cefbb63227 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Toward 6G Networks: Use Cases and Technologies,
Reference 1
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation b0d2db26-80c7-47e4-b093-7407ded7c7f2 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Preparing a nation for autonomous vehicles: opportunities, barriers and policy recommendations,
Reference 2
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 5619dc93-5e1c-457f-8eea-dc9610934757 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Connected vehicles: Solutions and challenges,
Reference 3
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation c1de3f94-09e3-4eb1-bb95-5228e01cb1ce · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data LiDAR for autonomous driving: The principles, challenges, and trends for automotive LiDAR and perception systems,
Reference 4
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 63bbae1a-44e7-4d46-a390-cff3a69d7684 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Deep multi-modal object detection and semantic segmentation for autonomous driving: Datasets, methods, and challenges,
Reference 5
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation b9c635ff-61c8-4919-95f5-dab1f47a532c · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Enhancements of V2X communication in support of cooperative autonomous driving,
Reference 6
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation daf7017b-0bc1-449e-83e5-6b9c0b310aed · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Value- anticipating V2V communications for cooperative perception,
Reference 7
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 97c64b37-1cd3-4c7f-a13b-b5740ce007ab · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data SELMA: SEmantic Large-Scale Multimodal Acquisitions in Variable Weather, Daytime and Viewpoints,
Reference 8
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation b75e0caf-f4f2-4172-9a19-0efb6ec1b9b8 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Toward Standardization of Millimeter-Wave Vehicle-to-Vehicle Networks: Open Challenges and Performance Evaluation,
Reference 9
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 61db7dd4-6084-4b74-8131-4055993340ce · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Point cloud compression for efficient data broadcasting: A performance com- parison,
Reference 10
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 51cb8360-cd2b-422a-b246-39ae19758cf7 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data SemanticKITTI: A dataset for semantic scene understanding of LiDAR sequences,
Reference 11
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 8a90baa0-6357-4cd1-bab5-2e3c0b2d29f6 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data An overview of ongoing point cloud compression standardization activities: Video-based (V-PCC) and geometry-based (G-PCC),
Reference 12
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 47e12cb7-263c-4612-93ad-ec3e2e2123ff · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Accuracy versus complexity for mmWave ray-tracing: A full stack perspective,
Reference 13
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation ca6e48d6-956e-48ce-ad34-08f8de72c49c · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Stochastic models for generating synthetic HTTP source traffic,
Reference 14
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation e6bbbfcb-0cc6-468e-bf9f-c8be0e3d2524 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data An ns-3 implementation of a bursty traffic framework for virtual reality sources,
Reference 15
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 7df77533-a882-488c-bfba-d8d8b678fecf · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Statistical mod- elling of measured automotive radar reflections,
Reference 16
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation b4c73d55-52bc-4989-a123-8c82c008cdbc · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Statistical modelling of multi-sensor data fusion,
Reference 17
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation a719a37f-284a-435f-9ba8-23a61442aa54 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Hybrid Point Cloud Semantic Compression for Automotive Sensors: A Performance Evaluation,
Reference 18
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation c008fa0c-8eb9-42a1-aae3-0619402a4792 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Application of bootstrap method in Kolmogorov-Smirnov test,
Reference 19
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation d9a222b2-4e14-4874-a9ca-3613730b2c23 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Millimeter-wave vehicular communication to support massive automotive sensing,
Reference 20
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation ea71d19a-c14e-449d-afd5-207c52b57109 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Service requirements for enhanced V2X scenarios,
Reference 21
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation ea1594f3-7afd-4c54-a3ea-1e06574d4222 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data A SDN- based fine-grained measurement and modeling approach to vehicular communication network traffic,
Reference 22
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation ae827cc2-bd7e-4d73-a7ac-f40471be96a3 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Network traffic characteristics of machine learning frameworks under the microscope,
Reference 23
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 417fdbbd-32d2-450a-85a8-3181e9d38a63 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data A Survey on 5G Usage Scenarios and Traffic Models,
Reference 24
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation eb993196-480d-4c83-b8c3-a93d1aa10dde · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data New Traffic Model of M2M Technology in 5G Wireless Sensor Networks,
Reference 25
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 23969fa5-1c54-43f5-9839-ac27c7c923ed · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data State modulated traffic models for machine type communications,
Reference 26
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation f0a8d409-c558-47c2-a9f1-3ca8b27e3d12 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Comparison of M2M traffic models against real world data sets,
Reference 27
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation dcb2ed4a-481a-4a66-8d0b-5a059604ca5f · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data A Survey of IoT Applications in Blockchain Systems: Architecture, Consensus, and Traffic Modeling,
Reference 28
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 88844528-d505-453e-b2f5-9da837c2cd1d · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data A survey of VBR video traffic models,
Reference 29
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 0e889204-7462-4527-bfc8-5a107eb2dc0f · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Adaptive LSTAR Model for Long-Range Variable Bit Rate Video Traffic Prediction,
Reference 30
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 18ec1cb5-d3ab-4f33-aab3-fcf0447573ff · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Temporal characterization of XR traffic with application to predictive network slicing,
Reference 31
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 9dd791e3-97f9-4c63-a4ab-0d8cd6ecc03c · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Temporal characterization and prediction of VR traffic: A network slicing use case,
Reference 32
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 1ec73fba-973c-4dce-b231-7827ff351bac · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Coupled Markovian Arrival Process for Automotive Machine Type Communication traffic modeling,
Reference 33
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 1a49256b-4c0e-447e-b633-f3dc7fab698a · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Network Traffic Prediction Based on Deep Belief Network and Spa- tiotemporal Compressive Sensing in Wireless Mesh Backbone Networks,
Reference 34
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 5acc99f4-255f-4202-a3f1-209455c33435 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Long short-term memory neural network for network traffic prediction,
Reference 35
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 7932e11f-d841-493b-aa37-3c32f74c4f5c · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data LNTP: An End-to-End Online Prediction Model for Network Traffic,
Reference 36
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 3d0e1555-98d6-44ca-8df7-2ea23e0a7da2 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data A Real- Time High-Definition Vehicular Sensor Data Sharing System using Millimeter Wave V2V Communications,
Reference 37
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 0385d670-f574-4f7a-a7ff-c9755ec1fe15 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Low-latency high-level data sharing for connected and autonomous vehicular networks,
Reference 38
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation c2706fcb-7843-47be-89b7-13dc39d8401d · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data RangeNet ++: Fast and Accurate LiDAR Semantic Segmentation,
Reference 39
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation fb5ec707-77c2-4229-982b-e3c1eb575421 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Draco 3D Data Compression,
Reference 40
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 56e19ef9-3395-4336-a8c2-6affcfb1743c · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Graph Attention Convolution for Point Cloud Semantic Segmentation,
Reference 41
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 8bb40372-d343-4c54-b1b8-d07d7a1328a1 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data SEGCloud: Semantic Segmentation of 3D Point Clouds,
Reference 42
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 528fe4c8-f575-49d6-a42a-134aa0f8c6e4 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Perturbed Self-Distillation: Weakly Supervised Large-Scale Point Cloud Semantic Segmentation,
Reference 43
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 03e57b84-a19f-4964-8729-53daacbc8027 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data PolarNet: An Improved Grid Representation for Online LiDAR Point Clouds Semantic Segmentation,
Reference 44
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation c2bdb6bd-3221-4156-aeae-641b54276e77 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data SqueezeSegV2: Improved Model Structure and Unsupervised Domain Adaptation for Road-Object Segmentation from a LiDAR Point Cloud,
Reference 45
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation fd79b757-8553-4388-8341-60c67a6e8a7b · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Effects of JPEG compression on image classification,
Reference 46
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 6c83e212-ef1e-4804-93e4-d973d5e16d0b · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data First Gradually, Then Suddenly: Understanding the Impact of Image Compression on Object Detection Using Deep Learning,
Reference 47
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation d3bd0f28-6321-4870-8dbf-fa89374eb477 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Impact of image compression on deep learning-based mammogram classification,
Reference 48
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 3929fed7-28ff-4e22-9834-fec084606916 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Geometric distortion metrics for point cloud compression,
Reference 49
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation d4054587-8eb6-4560-8c45-30d32bbf92a3 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data The Kolmogorov-Smirnov test for goodness of fit,
Reference 50
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation d75d2099-182c-437a-abba-53b70f300cda · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Goodness-of-fit tests when parameters are estimated,
Reference 51
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 0a3a3301-3b97-42b0-8ff3-a9b3bb0d6838 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Astrostatistics: Goodness-of-fit and all that!
Reference 52
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation a07637f8-ba56-49ee-8dc8-680a8b33358b · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Network simulations with the ns-3 simulator,
Reference 53
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation cd77abfe-2ef1-4c1c-b0f5-ebe0c6d302bc · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data MilliCar: An ns-3 module for mmWave NR V2X networks,
Reference 54
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 30d6c616-8054-4b00-9bf5-bd10096c3a6a · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Recent development and applications of SUMO-Simulation of Urban MObility,
Reference 55
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 70fbfbc9-40af-44d6-9dd7-cff59ab58756 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Artificial Intelligence in Vehicular Wireless Networks: A Case Study Using ns-3,
Reference 56
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 9f7d8b8e-096e-4a68-970c-6e719609af89 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data An Open Framework for Analyzing and Modeling XR Network Traffic,
Reference 57
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation dbd32100-749b-40a9-afd7-7267432a357d · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data End-to-end simulation of 5g mmwave networks,
Reference 58
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 81a58cc6-351b-4f04-be34-ec62e73fb2a9 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data An LTE module for the ns-3 network simulator,
Reference 59
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation b2e09eb9-b6a9-4e0b-a53e-c7385d4177a0 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Sampling Student’s T distribution-use of the inverse cumulative distribution function,
Reference 60
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation b0641446-b14e-4aae-ae8b-f18d55ffb9d4 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Unresolved cited work
Reference 61
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation b76b9f57-d8d5-458c-9c19-9fd1956a0b7a · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Study on channel model for frequencies from 0.5 to 100 GHz,
Reference 62
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 0d33afc6-66bb-4029-8029-d4a2ecb1a807 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Interworking of DSRC and Cellular Network Technologies for V2X Communications: A Survey,
Reference 63
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation 3dda64e7-7223-404c-958f-81c1c4435454 · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data A reinforcement learning framework for PQoS in a teleoperated driving scenario,
Reference 64
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-19T06:32:44.657259+00:00.
Observation d94d99ee-21e3-4082-a7fa-442352ad739a · outbound
Statistical Analysis and End-to-End Performance Evaluation of Traffic Models for Automotive Data Federated Reinforcement Learning to Optimize Teleoperated Driving Networks
Reference 65
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
No inbound Pith citation observations are available.