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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1957 Sep 15;43(9):842–844. doi: 10.1073/pnas.43.9.842

TWO THEOREMS IN GRAPH THEORY

Claude Berge 1,*
PMCID: PMC534337  PMID: 16590096

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