@article{bwmeta1.element.bwnjournal-article-fmv64i1p7bwm,
author = {J. Hempel and D. McMillan},
title = {Covering three-manifolds with open cells},
journal = {Fundamenta Mathematicae},
volume = {64},
year = {1969},
pages = {99-104},
zbl = {0176.53302},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv64i1p7bwm}
}
Hempel, J.; McMillan, D. Covering three-manifolds with open cells. Fundamenta Mathematicae, Tome 64 (1969) pp. 99-104. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv64i1p7bwm/