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Discussiones Mathematicae Graph Theory > 2006 > 26 > 3 > 457-474
Discussiones Mathematicae Graph Theory > 1998 > 18 > 1 > 63-72
Discussiones Mathematicae Graph Theory > 2006 > 26 > 3 > 457-474
Discussiones Mathematicae Graph Theory > 1998 > 18 > 1 > 63-72