@article{1077469295,
author = {Church, Philip T. and Hemmingsen, Erik},
title = {Light open maps on $n$ -manifolds},
journal = {Duke Math. J.},
volume = {27},
number = {1},
year = {1960},
pages = { 527-536},
language = {en},
url = {http://dml.mathdoc.fr/item/1077469295}
}
Church, Philip T.; Hemmingsen, Erik. Light open maps on $n$ -manifolds. Duke Math. J., Tome 27 (1960) no. 1, pp. 527-536. http://gdmltest.u-ga.fr/item/1077469295/