@article{DAN_1973_211_5_a9,
     author = {S. A. Liber},
     title = {On a problem of {A.\,I.~Mal'cev}},
     journal = {Doklady Akademii Nauk},
     pages = {1050--1052},
     publisher = {mathdoc},
     volume = {211},
     number = {5},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_211_5_a9/}
}