Assertion: covering graph | /r/HasProperty | studied by berge
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Source sentences:
text: It also includes, for instance, the bipartite well-covered graphs studied by Ravindra (1977) and Berge (1981): in bipartite graph without isolated vertices, both sides of any bipartition form maximal independent sets (and minimal vertex covers), so if the graph is well-covered both sides must have equally many vertices.