@article{1077466403,
author = {Williams, R. F.},
title = {Local properties of open mappings},
journal = {Duke Math. J.},
volume = {22},
number = {1},
year = {1955},
pages = { 339-345},
language = {en},
url = {http://dml.mathdoc.fr/item/1077466403}
}
Williams, R. F. Local properties of open mappings. Duke Math. J., Tome 22 (1955) no. 1, pp. 339-345. http://gdmltest.u-ga.fr/item/1077466403/