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Information Processing Letters > 2014 > 114 > 11 > 639-642
Information Processing Letters > 2012 > 112 > 24 > 937-941
Electronic Notes in Discrete Mathematics > 2011 > 37 > Complete > 345-350
Theoretical Computer Science > 2010 > 411 > 31-33 > 2773-2783
Journal of Discrete Algorithms > 2007 > 5 > 2 > 262-279