@article{DAN_1958_118_4_a7,
     author = {S. A. Chunikhin},
     title = {Sets of non-special semigroups and $p$-nilpotency of finite groups},
     journal = {Doklady Akademii Nauk},
     pages = {654--656},
     year = {1958},
     volume = {118},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_118_4_a7/}
}