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Journal of Combinatorial Optimization > 2017 > 34 > 2 > 656-659
Discrete Mathematics > 2016 > 339 > 4 > 1221-1231
Theoretical Computer Science > 2015 > 605 > C > 95-105
Discrete Mathematics > 2009 > 309 > 5 > 1079-1083
Discussiones Mathematicae Graph Theory > 2000 > 20 > 1 > 57-69