{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:ALCXMTEFPJTCMDGI452WQYXISJ","short_pith_number":"pith:ALCXMTEF","canonical_record":{"source":{"id":"1210.3727","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2012-10-13T17:53:39Z","cross_cats_sorted":["cs.DL"],"title_canon_sha256":"2a6da22c10af4950deb4c9042118414f5a82356d698af4f3f88bd3ee541b4ad2","abstract_canon_sha256":"77aee28f33bddb6216795f62a507a94dded1284af117229075c82c9b1f836b3e"},"schema_version":"1.0"},"canonical_sha256":"02c5764c857a66260cc8e7756862e8924f1c67cad6531774a49c2060de64406a","source":{"kind":"arxiv","id":"1210.3727","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1210.3727","created_at":"2026-05-18T03:40:13Z"},{"alias_kind":"arxiv_version","alias_value":"1210.3727v2","created_at":"2026-05-18T03:40:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1210.3727","created_at":"2026-05-18T03:40:13Z"},{"alias_kind":"pith_short_12","alias_value":"ALCXMTEFPJTC","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_16","alias_value":"ALCXMTEFPJTCMDGI","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_8","alias_value":"ALCXMTEF","created_at":"2026-05-18T12:26:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:ALCXMTEFPJTCMDGI452WQYXISJ","target":"record","payload":{"canonical_record":{"source":{"id":"1210.3727","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2012-10-13T17:53:39Z","cross_cats_sorted":["cs.DL"],"title_canon_sha256":"2a6da22c10af4950deb4c9042118414f5a82356d698af4f3f88bd3ee541b4ad2","abstract_canon_sha256":"77aee28f33bddb6216795f62a507a94dded1284af117229075c82c9b1f836b3e"},"schema_version":"1.0"},"canonical_sha256":"02c5764c857a66260cc8e7756862e8924f1c67cad6531774a49c2060de64406a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:40:13.756409Z","signature_b64":"74xGqQpJfeAHLW8gFSWhJbXnvYp0TxUHhFRWAvWb8F1VZUW+3DirFl7nkwYvtDtSKayFHyqtuS23u+Uk7uZrCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"02c5764c857a66260cc8e7756862e8924f1c67cad6531774a49c2060de64406a","last_reissued_at":"2026-05-18T03:40:13.755413Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:40:13.755413Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1210.3727","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:40:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3bjCTL24S0o9HRxuIaG1jChmf0jW5239DDMAHOve3yFyLuJq1UOU+XZKuRK2gFSX4almXvModF8JQC7mVQvhBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T18:26:13.740893Z"},"content_sha256":"8e9fe6e7552da55aef6b296878b3906504cf54bc5d51b76319942069fef1ffe8","schema_version":"1.0","event_id":"sha256:8e9fe6e7552da55aef6b296878b3906504cf54bc5d51b76319942069fef1ffe8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:ALCXMTEFPJTCMDGI452WQYXISJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"How are academic age, productivity and collaboration related to citing behavior of researchers?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.DL"],"primary_cat":"physics.soc-ph","authors_text":"Sta\\v{s}a Milojevi\\'c","submitted_at":"2012-10-13T17:53:39Z","abstract_excerpt":"References are an essential component of research articles and therefore of scientific communication. In this study we investigate referencing (citing) behavior in five diverse fields (astronomy, mathematics, robotics, ecology and economics) based on 213,756 core journal articles. At the macro level we find: (a) a steady increase in the number of references per article over the period studied (50 years), which in some fields is due to a higher rate of usage, while in others reflects longer articles and (b) an increase in all fields in the fraction of older, foundational references since the 19"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1210.3727","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:40:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"97sE7y6jRP05kjMlEeGC7E/iOZBX4SzgisaueUku27SRVX0ryaluv4ZN9ZZaA5dPgpCIKhiv3E5YPRJX/ijqBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T18:26:13.741273Z"},"content_sha256":"6215025ad9f919bb39250ab1a14365192c3c291fcb4b04f0021ff1fbee877457","schema_version":"1.0","event_id":"sha256:6215025ad9f919bb39250ab1a14365192c3c291fcb4b04f0021ff1fbee877457"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ALCXMTEFPJTCMDGI452WQYXISJ/bundle.json","state_url":"https://pith.science/pith/ALCXMTEFPJTCMDGI452WQYXISJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ALCXMTEFPJTCMDGI452WQYXISJ/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-27T18:26:13Z","links":{"resolver":"https://pith.science/pith/ALCXMTEFPJTCMDGI452WQYXISJ","bundle":"https://pith.science/pith/ALCXMTEFPJTCMDGI452WQYXISJ/bundle.json","state":"https://pith.science/pith/ALCXMTEFPJTCMDGI452WQYXISJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ALCXMTEFPJTCMDGI452WQYXISJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:ALCXMTEFPJTCMDGI452WQYXISJ","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"77aee28f33bddb6216795f62a507a94dded1284af117229075c82c9b1f836b3e","cross_cats_sorted":["cs.DL"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2012-10-13T17:53:39Z","title_canon_sha256":"2a6da22c10af4950deb4c9042118414f5a82356d698af4f3f88bd3ee541b4ad2"},"schema_version":"1.0","source":{"id":"1210.3727","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1210.3727","created_at":"2026-05-18T03:40:13Z"},{"alias_kind":"arxiv_version","alias_value":"1210.3727v2","created_at":"2026-05-18T03:40:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1210.3727","created_at":"2026-05-18T03:40:13Z"},{"alias_kind":"pith_short_12","alias_value":"ALCXMTEFPJTC","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_16","alias_value":"ALCXMTEFPJTCMDGI","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_8","alias_value":"ALCXMTEF","created_at":"2026-05-18T12:26:58Z"}],"graph_snapshots":[{"event_id":"sha256:6215025ad9f919bb39250ab1a14365192c3c291fcb4b04f0021ff1fbee877457","target":"graph","created_at":"2026-05-18T03:40:13Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"References are an essential component of research articles and therefore of scientific communication. In this study we investigate referencing (citing) behavior in five diverse fields (astronomy, mathematics, robotics, ecology and economics) based on 213,756 core journal articles. At the macro level we find: (a) a steady increase in the number of references per article over the period studied (50 years), which in some fields is due to a higher rate of usage, while in others reflects longer articles and (b) an increase in all fields in the fraction of older, foundational references since the 19","authors_text":"Sta\\v{s}a Milojevi\\'c","cross_cats":["cs.DL"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2012-10-13T17:53:39Z","title":"How are academic age, productivity and collaboration related to citing behavior of researchers?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1210.3727","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:8e9fe6e7552da55aef6b296878b3906504cf54bc5d51b76319942069fef1ffe8","target":"record","created_at":"2026-05-18T03:40:13Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"77aee28f33bddb6216795f62a507a94dded1284af117229075c82c9b1f836b3e","cross_cats_sorted":["cs.DL"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2012-10-13T17:53:39Z","title_canon_sha256":"2a6da22c10af4950deb4c9042118414f5a82356d698af4f3f88bd3ee541b4ad2"},"schema_version":"1.0","source":{"id":"1210.3727","kind":"arxiv","version":2}},"canonical_sha256":"02c5764c857a66260cc8e7756862e8924f1c67cad6531774a49c2060de64406a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"02c5764c857a66260cc8e7756862e8924f1c67cad6531774a49c2060de64406a","first_computed_at":"2026-05-18T03:40:13.755413Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:40:13.755413Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"74xGqQpJfeAHLW8gFSWhJbXnvYp0TxUHhFRWAvWb8F1VZUW+3DirFl7nkwYvtDtSKayFHyqtuS23u+Uk7uZrCA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:40:13.756409Z","signed_message":"canonical_sha256_bytes"},"source_id":"1210.3727","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8e9fe6e7552da55aef6b296878b3906504cf54bc5d51b76319942069fef1ffe8","sha256:6215025ad9f919bb39250ab1a14365192c3c291fcb4b04f0021ff1fbee877457"],"state_sha256":"496056bd6cef74070b62dcd174f3c0d5450bfe72a4740e3f02eba1bfe85596a7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1QKFbaK/JNFnEj9+rbeSHHfjAB9RnNkwPAlyGJaYGLKQ3+hCFJVaRtKfL68MJ3Vgc/dX0DH+x+t/GrDZrQ3cDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T18:26:13.743439Z","bundle_sha256":"5b0d0629fc72e66075e52a0057c9460e701238bad3f50ebf1ea72b3bdb114975"}}