@article{CTGDC_2008__49_2_142_0,
author = {Ehresmann, Andr\'ee},
title = {Fifty years of research},
journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques},
volume = {49},
year = {2008},
pages = {142-152},
mrnumber = {2426400},
zbl = {1147.01320},
language = {en},
url = {http://dml.mathdoc.fr/item/CTGDC_2008__49_2_142_0}
}
Ehresmann, Andrée C. Fifty years of research. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 49 (2008) pp. 142-152. http://gdmltest.u-ga.fr/item/CTGDC_2008__49_2_142_0/