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when toggle format what by license comment
Apr 5, 2016 at 16:39 comment added j.c. Here's more of the reference: Hliněný and Kratochvı́l, Discrete Mathematics 229: 101–124 (2001). The paper is available online here sciencedirect.com/science/article/pii/S0012365X00002041
Jan 13, 2012 at 12:42 comment added Igor Rivin This is clearly THE answer, interesting though @Igor Pak's is.
Jan 13, 2012 at 4:43 history answered ball CC BY-SA 3.0