http://www.journals.elsevier.com/polyhedron/cover-gallery/
http://www.sciencedirect.com/science/article/pii/S0277538714002484
DOI: 10.1016/j.poly.2014.04.037
http://www.journals.elsevier.com/polyhedron/cover-gallery/
http://www.sciencedirect.com/science/article/pii/S0277538714002484
DOI: 10.1016/j.poly.2014.04.037