@article{1077488862,
author = {van Kampen, Egbertus R.},
title = {On some characterizations of $2$ -dimensional manifolds},
journal = {Duke Math. J.},
volume = {1},
number = {1},
year = {1935},
pages = { 74-93},
language = {en},
url = {http://dml.mathdoc.fr/item/1077488862}
}
van Kampen, Egbertus R. On some characterizations of $2$ -dimensional manifolds. Duke Math. J., Tome 1 (1935) no. 1, pp. 74-93. http://gdmltest.u-ga.fr/item/1077488862/