On the Numbers of Positive and Negative Eigenvalues of a Graph
Publications de l'Institut Mathématique, _N_S_51 (1992) no. 65, p. 25 .

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We consider simple connected graphs with a fixed number of negative eigenvalues (including their multiplicities). We show that these graphs have uniformly bounded numbers of positive eigenvalues, and the last numbers run over a set $[m]=\{1,2,\ldots,m\}$.
Classification : 05C50
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     author = {Aleksandar Torga\v{s}ev},
     title = {On the {Numbers} of {Positive} and {Negative} {Eigenvalues} of a {Graph}},
     journal = {Publications de l'Institut Math\'ematique},
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     publisher = {mathdoc},
     volume = {_N_S_51},
     number = {65},
     year = {1992},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1992_N_S_51_65_a2/}
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Aleksandar Torgašev. On the Numbers of Positive and Negative Eigenvalues of a Graph. Publications de l'Institut Mathématique, _N_S_51 (1992) no. 65, p. 25 . http://geodesic.mathdoc.fr/item/PIM_1992_N_S_51_65_a2/