@article{1077471941, author = {Coxeter, H. S. M.}, title = {The map-coloring of unorientable surfaces}, journal = {Duke Math. J.}, volume = {10}, number = {1}, year = {1943}, pages = { 293-304}, language = {en}, url = {http://dml.mathdoc.fr/item/1077471941} }
Coxeter, H. S. M. The map-coloring of unorientable surfaces. Duke Math. J., Tome 10 (1943) no. 1, pp. 293-304. http://gdmltest.u-ga.fr/item/1077471941/