@article{DAN_1961_139_1_a12,
     author = {S. A. Chunikhin},
     title = {Extensions of the indexial of a finite group},
     journal = {Doklady Akademii Nauk},
     pages = {52--53},
     publisher = {mathdoc},
     volume = {139},
     number = {1},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_139_1_a12/}
}