A new characterization of strictly interval graphs yields a linear recognition algorithm, and SI-core graphs are defined as non-split non-cograph graphs with several Laplacian integral members.
(2025), Entry A000041 in The On-Line Encyclo- pedia of Integer Sequences, https://oeis.org/A000041
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Structural and Spectral Properties of Strictly Interval Graphs
A new characterization of strictly interval graphs yields a linear recognition algorithm, and SI-core graphs are defined as non-split non-cograph graphs with several Laplacian integral members.