Combinatorial Groupoids, Cubical Complexes, and the Lovász Conjecture.

Rade T. Zivaljevic Combinatorial Groupoids, Cubical Complexes, and the Lovász Conjecture. 135-161 2009 41 Discrete & Computational Geometry 1 http://dx.doi.org/10.1007/s00454-008-9062-1 db/journals/dcg/dcg41.html#Zivaljevic09