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Discussiones Mathematicae Graph Theory > 2017 > 37 > 1 > 239-249
Discrete Applied Mathematics > 2014 > 177 > Complete > 80-87
Discussiones Mathematicae Graph Theory > 2006 > 26 > 2 > 231-248
IEEE Transactions on Pattern Analysis and Machine Intelligence > 1984 > PAMI-6 > 5 > 652 - 656