@article{bwmeta1.element.bwnjournal-article-fmv32i1p13bwm,
author = {J. Whitehead},
title = {On the asphericity of regions in a 3-sphere},
journal = {Fundamenta Mathematicae},
volume = {32},
year = {1939},
pages = {149-166},
zbl = {0021.16203},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv32i1p13bwm}
}
Whitehead, J. On the asphericity of regions in a 3-sphere. Fundamenta Mathematicae, Tome 32 (1939) pp. 149-166. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv32i1p13bwm/