Geodesic
Spectral Characterizations of Line Graphs. Variations on the Theme
Publications de l'Institut Mathématique, _N_S_34 (1983) no. 48, p. 31 .

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The following three topics related to spectral characterizations of line graphs are discussed: local structure of regular graphs with the least eigenvalue $-2$ which contain $K_{1,3}$ as an induced subgraph, switching regular line graphs into regular graphs which are not line graphs, and line switching (of graphs) as a modification of familiar (vertex) switching.
Classification : 05C50 
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     author = {Drago\v{s} Cvetkovi\'c},
     title = {Spectral {Characterizations} of {Line} {Graphs.} {Variations} on the {Theme}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {31 },
     publisher = {mathdoc},
     volume = {_N_S_34},
     number = {48},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1983_N_S_34_48_a5/}
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Dragoš Cvetković. Spectral Characterizations of Line Graphs. Variations on the Theme. Publications de l'Institut Mathématique, _N_S_34 (1983) no. 48, p. 31 . http://geodesic.mathdoc.fr/item/PIM_1983_N_S_34_48_a5/