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On integral graphs which belong to the class $\overline {αK_{a,a}\cup βK_{b,b}}$. (English)
J. Appl. Math. Comput. 20, No. 1-2, 61-74 (2006).
Summary: Let $G$ be a simple graph and let $\overline{G}$ denote its complement. We say that $G$ is integral if its spectrum consists of integral values. In this work we establish a characterization of integral graphs which belong to the class $\overline {αK_{a,a}\cup βK_{b,b}}$ where $mG$ denotes the $m$-fold union of the graph $G$.