Geodesic
Some Results on Graphs With at Most two Positive Eigenvalues
Publications de l'Institut Mathématique, _N_S_50 (1991) no. 64, p. 39 .

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

We determine all graphs $G$ such that $G$ and its complementary graph $\bar G$ have exactly one (or, respectively, exactly two) positive eigenvalues.
Classification : 05C50 
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     author = {Miroslav Petrovi\'c},
     title = {Some {Results} on {Graphs} {With} at {Most} two {Positive} {Eigenvalues}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {39 },
     publisher = {mathdoc},
     volume = {_N_S_50},
     number = {64},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1991_N_S_50_64_a6/}
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Miroslav Petrović. Some Results on Graphs With at Most two Positive Eigenvalues. Publications de l'Institut Mathématique, _N_S_50 (1991) no. 64, p. 39 . http://geodesic.mathdoc.fr/item/PIM_1991_N_S_50_64_a6/