Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1965_161_5_a5, author = {B. V. Popov}, title = {Semigroups of transformations of rank not exceeding two}, journal = {Doklady Akademii Nauk}, pages = {1019--1022}, publisher = {mathdoc}, volume = {161}, number = {5}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1965_161_5_a5/} }
B. V. Popov. Semigroups of transformations of rank not exceeding two. Doklady Akademii Nauk, Tome 161 (1965) no. 5, pp. 1019-1022. http://geodesic.mathdoc.fr/item/DAN_1965_161_5_a5/