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Discussiones Mathematicae Graph Theory > 2014 > 34 > 3 > 629-632
Discussiones Mathematicae Graph Theory > 2002 > 22 > 1 > 199-210
Discussiones Mathematicae Graph Theory > 2014 > 34 > 3 > 629-632
Discussiones Mathematicae Graph Theory > 2002 > 22 > 1 > 199-210