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Opuscula Mathematica > 2009 > Vol. 29, no. 2 > 157-164
Discussiones Mathematicae Graph Theory > 2008 > 28 > 2 > 361-366
Discrete Mathematics > 2006 > 306 > 17 > 2031-2037
Discussiones Mathematicae Graph Theory > 2005 > 25 > 3 > 355-361