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Fundamenta Informaticae > 2020 > Vol. 172, nr 1 > 97--104
Discussiones Mathematicae Graph Theory > 2017 > 38 > 1 > 63-74
Open Mathematics > 2013 > 11 > 6 > 1153-1157
Central European Journal of Mathematics > 2013 > 11 > 6 > 1153-1157