A graph is said to be disconnected if it has at least two components that are not isolated vertices. Up to now, many scholars have made a lot of researches on the graceful graphs. As for the gracefulness of the disconnected graphs, however, little work ha
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李忠祥,翁国清.关于不连通优美图及优美图的构造[J].重庆工商大学学报(自然科学版),1989,(3): Li Zhong-Xiang Weng Guo-qing. On Graceful Disconnected Graphs and Construction of Graceful Grahhs[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),1989,(3):