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@article{MV_1972_24_1_a21, author = {D. M. Cvetkovi\'c and I. M. Gutman}, title = {The algebraic multiplicity of the number zero in the spectrum of a bipartite graph}, journal = {Matemati\v{c}ki vesnik}, pages = {141 }, publisher = {mathdoc}, volume = {24}, number = {1}, year = {1972}, url = {http://geodesic.mathdoc.fr/item/MV_1972_24_1_a21/} }
D. M. Cvetković; I. M. Gutman. The algebraic multiplicity of the number zero in the spectrum of a bipartite graph. Matematički vesnik, Tome 24 (1972) no. 1, p. 141 . http://geodesic.mathdoc.fr/item/MV_1972_24_1_a21/