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Discussiones Mathematicae Graph Theory > 2008 > 28 > 3 > 563-566
Discussiones Mathematicae Graph Theory > 2007 > 27 > 3 > 603-610
Discussiones Mathematicae Graph Theory > 2008 > 28 > 3 > 563-566
Discussiones Mathematicae Graph Theory > 2007 > 27 > 3 > 603-610