@article{2625,
author = {Chew, James},
title = {Topological groupoids whose elements have "approximate" inverses},
journal = {Portugaliae mathematica},
volume = {29},
year = {1970},
pages = {113-118},
zbl = {0216.34204},
mrnumber = {0285657},
language = {en},
url = {http://dml.mathdoc.fr/item/2625}
}
Chew, James. Topological groupoids whose elements have "approximate" inverses. Portugaliae mathematica, Tome 29 (1970) pp. 113-118. http://gdmltest.u-ga.fr/item/2625/