Alireza Fiuj Laali - Shahed university, Tehran, Iran.
Hamid Haj Seyyed Javadi - Shahed university, Tehran, Iran.

In this paper‎, ‎we construct a new class of integral bipartite graphs (not necessarily trees) with large even diameters‎. ‎In fact‎, ‎for every finite set A of positive integers of size k we construct an integral bipartite graph G of diameter ۲k such that the set of positive eigenvalues of G is exactly A‎. ‎This class of integral bipartite graphs has never found before‎.

Integral graph, Diameter, root