Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1962_6_a2, author = {V. V. Vagner}, title = {Restrictive semigroups}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {19--27}, publisher = {mathdoc}, number = {6}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1962_6_a2/} }
V. V. Vagner. Restrictive semigroups. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1962), pp. 19-27. http://geodesic.mathdoc.fr/item/IVM_1962_6_a2/