@article{MVK_2011_2_a4,
     author = {V. G. Smirnov},
     title = {Layers and cyclic factors of finite semigroups},
     journal = {Matemati\v{c}eskie voprosy kriptografii},
     pages = {75--95},
     publisher = {mathdoc},
     volume = {2},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MVK_2011_2_a4/}
}