PUBLICATIONS DE L'INSTITUT MATHÉMATIQUE (BEOGRAD) (N.S.) Vol. 38(52), pp. 3133 (1985) 

ON SPECTRUM AND PERSPECTRUM OF GRAPHSMieczyslaw BorowieckiHigher College of Engineering, Department of Mathematics 65246 Zielona Góra, Podgórna 50, PolandAbstract: We show that spectrum and perspectrum of a graph $G$ is $[x_1,\dots,x_n]$ and $[ix_1,\dots,ix_n]$, respectively,, iff $G$ is a bipartite graph without cycles of length $k$, $k=0\pmod4$. Classification (MSC2000): 05C50 Full text of the article:
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