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Discussiones Mathematicae Graph Theory > 2005 > 25 > 3 > 225-239
Discussiones Mathematicae Graph Theory > 2001 > 21 > 1 > 119-136
Discussiones Mathematicae Graph Theory > 2005 > 25 > 3 > 225-239
Discussiones Mathematicae Graph Theory > 2001 > 21 > 1 > 119-136