@article{1183498239, author = {Kittell, Irving}, title = {A group of operations on a partially colored map}, journal = {Bull. Amer. Math. Soc.}, volume = {41}, number = {12}, year = {1935}, pages = { 407-413}, language = {en}, url = {http://dml.mathdoc.fr/item/1183498239} }
Kittell, Irving. A group of operations on a partially colored map. Bull. Amer. Math. Soc., Tome 41 (1935) no. 12, pp. 407-413. http://gdmltest.u-ga.fr/item/1183498239/