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We give a sharp refinement of a result of Alon, Ben-Shimon and Krivelevich.This gives a sufficient condition for a finite sequence of positive integers tobe the vertex degree list of both parts of a bipartite graph. The conditiondepends only on the length of the sequence and its largest and smallestelements.

A sharp refinement of a result of Alon, Ben-Shimon and Krivelevich on bipartite graph vertex sequences