Daniel Král Edita Mácajová Ondrej Pangrác André Raspaud Jean-Sébastien Sereni Martin Skoviera Projective, affine, and abelian colorings of cubic graphs. 53-69 2009 30 Eur. J. Comb. 1 http://dx.doi.org/10.1016/j.ejc.2007.11.029 db/journals/ejc/ejc30.html#KralMPRSS09