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Annales UMCS, Mathematica > 2011 > 65 > 1 > 11-19
Discussiones Mathematicae Graph Theory > 2007 > 27 > 2 > 281-297
Annales UMCS, Mathematica > 2011 > 65 > 1 > 11-19
Discussiones Mathematicae Graph Theory > 2007 > 27 > 2 > 281-297