@article{1077469842,
author = {Church, P. T. and Hemmingsen, E.},
title = {Light open maps on $n$ -manifolds. II},
journal = {Duke Math. J.},
volume = {28},
number = {1},
year = {1961},
pages = { 607-623},
language = {en},
url = {http://dml.mathdoc.fr/item/1077469842}
}
Church, P. T.; Hemmingsen, E. Light open maps on $n$ -manifolds. II. Duke Math. J., Tome 28 (1961) no. 1, pp. 607-623. http://gdmltest.u-ga.fr/item/1077469842/