Yury Chebiryak Daniel Kroening Towards a Classification of Hamiltonian Cycles in the 6-Cube. 57-74 2008 4 JSAT 1 http://jsat.ewi.tudelft.nl/content/volume4/JSAT4_4_Chebiryak.pdf db/journals/jsat/jsat4.html#ChebiryakK08