Robert E. L. Aldred Martin Funk Bill Jackson Domenico Labbate John Sheehan Regular bipartite graphs with all 2-factors isomorphic. 151-161 2004 92 J. Comb. Theory, Ser. B 1 http://dx.doi.org/10.1016/j.jctb.2004.05.002 db/journals/jct/jctb92.html#AldredFJLS04