@article{1183511051, author = {Reichelderfer, Paul V.}, title = {The essential part of a surface}, journal = {Bull. Amer. Math. Soc.}, volume = {53}, number = {12}, year = {1947}, pages = { 845-855}, language = {en}, url = {http://dml.mathdoc.fr/item/1183511051} }
Reichelderfer, Paul V. The essential part of a surface. Bull. Amer. Math. Soc., Tome 53 (1947) no. 12, pp. 845-855. http://gdmltest.u-ga.fr/item/1183511051/