Abstract
Let k be a positive integer. Let G be a graph of order $$n\ge 3$$nź3 and W a subset of V(G) with $$|W|\ge 3k$$|W|ź3k. Wang (J Graph Theory 78:295---304, 2015) proved that if $$d(x)\ge 2n/3$$d(x)ź2n...
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