Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1967_10_a1, author = {V. V. Vagner}, title = {Diagrammatizable semigroupoids and generalized groupoids}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {11--23}, publisher = {mathdoc}, number = {10}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1967_10_a1/} }
V. V. Vagner. Diagrammatizable semigroupoids and generalized groupoids. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 10 (1967), pp. 11-23. http://geodesic.mathdoc.fr/item/IVM_1967_10_a1/