@article{GDZPPN00125135X,
title = {Continuously factorable groupoids.},
journal = {Semigroup forum},
volume = {12},
year = {1976},
pages = {251-264},
zbl = {0327.22002},
url = {http://dml.mathdoc.fr/item/GDZPPN00125135X}
}
Sigmon, K.; Hu, H.-T. Continuously factorable groupoids.. Semigroup forum, Tome 12 (1976) pp. 251-264. http://gdmltest.u-ga.fr/item/GDZPPN00125135X/