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Journal of Geometry > 2017 > 108 > 3 > 1137-1155
Electronic Notes in Discrete Mathematics > 2005 > 22 > Complete > 487-490
Discrete Mathematics > 2004 > 276 > 1-3 > 219-227
Electronic Notes in Discrete Mathematics > 2001 > 8 > Complete > 42-45
Electronic Notes in Discrete Mathematics > 2000 > 5 > Complete > 145-148