@article{DAN_1988_299_4_a13,
     author = {R. B. Feizullaev},
     title = {Semigroups of transformations of fixed rank},
     journal = {Doklady Akademii Nauk},
     pages = {829--831},
     year = {1988},
     volume = {299},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_299_4_a13/}
}