P. A. Catlin posed a question: Let G be a graph, and let H be a connected subgraph of G. When it is known that the graph G/H(obtained from G by contracting H to a vertex)has a spanning Eulerian subgraph, under what conditions can it be inferred that G its
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李登信 王斌 等.关于判定超欧拉图的收缩法[J].智能科学与工程学报,2003,(1): LI Deng - xin, WANG Bin, LI Xiao - min. On contraction method to determine whether a graph is supereulerian[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),2003,(1):