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Discussiones Mathematicae Graph Theory > 2010 > 30 > 3 > 475-487
Discussiones Mathematicae Graph Theory > 2002 > 22 > 2 > 335-347
Discussiones Mathematicae Graph Theory > 2010 > 30 > 3 > 475-487
Discussiones Mathematicae Graph Theory > 2002 > 22 > 2 > 335-347