Tomás Kaiser Daniel Král Riste Skrekovski Xuding Zhu The circular chromatic index of graphs of high girth. 1-13 2007 97 J. Comb. Theory, Ser. B 1 http://dx.doi.org/10.1016/j.jctb.2006.03.002 db/journals/jct/jctb97.html#KaiserKSZ07