Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1972_5_a9, author = {B. N. Lavrov}, title = {Maximal semigroups}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {66--73}, publisher = {mathdoc}, number = {5}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1972_5_a9/} }
B. N. Lavrov. Maximal semigroups. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1972), pp. 66-73. http://geodesic.mathdoc.fr/item/IVM_1972_5_a9/