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Discussiones Mathematicae Graph Theory > 2012 > 32 > 2 > 263-270
Discussiones Mathematicae Graph Theory > 2011 > 31 > 4 > 687-697
Discussiones Mathematicae Graph Theory > 2012 > 32 > 2 > 263-270
Discussiones Mathematicae Graph Theory > 2011 > 31 > 4 > 687-697