@article{DAN_1960_134_3_a4,
     author = {M. I. Kargapolov and Yu. I. Merzlyakov and V. N. Remeslennikov},
     title = {Completion of groups},
     journal = {Doklady Akademii Nauk},
     pages = {518--520},
     publisher = {mathdoc},
     volume = {134},
     number = {3},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_134_3_a4/}
}