@article{bwmeta1.element.bwnjournal-article-fmv111i1p19bwm, author = {Barry Graham}, title = {On contractible fans}, journal = {Fundamenta Mathematicae}, volume = {112}, year = {1981}, pages = {77-93}, zbl = {0379.54011}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv111i1p19bwm} }
Graham, Barry. On contractible fans. Fundamenta Mathematicae, Tome 112 (1981) pp. 77-93. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv111i1p19bwm/