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Discussiones Mathematicae Graph Theory > 2002 > 22 > 1 > 149-158
Discussiones Mathematicae Graph Theory > 1997 > 17 > 2 > 161-228
Discussiones Mathematicae Graph Theory > 2002 > 22 > 1 > 149-158
Discussiones Mathematicae Graph Theory > 1997 > 17 > 2 > 161-228