@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/