Abstract
A digraph is considered supereulerian if it possesses a spanning closed ditrail. Let n be positive integer and Dn,n be a bipartite digraph, whose vertices are divided into two equal parts of size n. If Dn,n is strongly connected and δ−+δ+≥n+1, where δ− is its minimum in-degree and δ+ is its minimum out-degree, then Dn,n is supereulerian digraph.
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