@article{DAN_1957_112_4_a1,
     author = {K. K. Billevich},
     title = {On the identity of two algebraic fields of order~$n$},
     journal = {Doklady Akademii Nauk},
     pages = {571--574},
     publisher = {mathdoc},
     volume = {112},
     number = {4},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_112_4_a1/}
}