@article{DAN_1960_134_1_a2,
     author = {A. V. Gladkii},
     title = {Groups with $k$-reducible basis},
     journal = {Doklady Akademii Nauk},
     pages = {16--18},
     publisher = {mathdoc},
     volume = {134},
     number = {1},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_134_1_a2/}
}