@article{IVM_1987_11_a12,
     author = {P. V. Shumyatskiǐ},
     title = {Periodic groups with a~regular four-group of automorphisms},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {78--82},
     year = {1987},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1987_11_a12/}
}