Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1965_1_a21, author = {B. M. Shain}, title = {Restrictive bi-semigroups}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {168--179}, publisher = {mathdoc}, number = {1}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1965_1_a21/} }
B. M. Shain. Restrictive bi-semigroups. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1965), pp. 168-179. http://geodesic.mathdoc.fr/item/IVM_1965_1_a21/