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Discussiones Mathematicae Graph Theory > 2011 > 31 > 3 > 547-557
Discrete Mathematics > 2008 > 308 > 2-3 > 242-254
Discussiones Mathematicae Graph Theory > 2011 > 31 > 3 > 547-557
Discrete Mathematics > 2008 > 308 > 2-3 > 242-254