@article{CTGDC_1981__22_3_301_0, author = {Barr, Michael and Diaconescu, Radu}, title = {On locally simply connected toposes and their fundamental groups}, journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques}, volume = {22}, year = {1981}, pages = {301-314}, mrnumber = {649078}, zbl = {0472.18002}, language = {en}, url = {http://dml.mathdoc.fr/item/CTGDC_1981__22_3_301_0} }
Barr, Michael; Diaconescu, Radu. On locally simply connected toposes and their fundamental groups. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 22 (1981) pp. 301-314. http://gdmltest.u-ga.fr/item/CTGDC_1981__22_3_301_0/
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