Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{CMUC_1977__18_2_a5, author = {Kepka, Tom\'a\v{s}}, title = {Epimorphisms in some groupoid varieties}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {265--279}, publisher = {mathdoc}, volume = {18}, number = {2}, year = {1977}, mrnumber = {0439714}, zbl = {0357.08002}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMUC_1977__18_2_a5/} }
Kepka, Tomáš. Epimorphisms in some groupoid varieties. Commentationes Mathematicae Universitatis Carolinae, Tome 18 (1977) no. 2, pp. 265-279. http://geodesic.mathdoc.fr/item/CMUC_1977__18_2_a5/