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G.Ringelposedtheproblemtofindasufficientandnecessaryconditionforagraphtotriangulateanorientablesurface.B.MoharandC.Thoma......
G.Ringelposedtheproblemtofindasufficientandnecessaryconditionforagraphtotriangulateanorientablesurface.B.MoharandC.Thoma......
