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Discussiones Mathematicae Graph Theory > 2006 > 26 > 2 > 335-342
Discussiones Mathematicae Graph Theory > 2001 > 21 > 1 > 137-143
Discussiones Mathematicae Graph Theory > 2006 > 26 > 2 > 335-342
Discussiones Mathematicae Graph Theory > 2001 > 21 > 1 > 137-143