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Colloquium Mathematicum > 1998 > 75 > 2 > 195-203
Discussiones Mathematicae Graph Theory > 1997 > 17 > 1 > 133-136
Colloquium Mathematicum > 1998 > 75 > 2 > 195-203
Discussiones Mathematicae Graph Theory > 1997 > 17 > 1 > 133-136