@article{AL_1980_19_5_a1,
     author = {Yu. L. Ershov},
     title = {On profinite groups},
     journal = {Algebra i logika},
     pages = {552--565},
     publisher = {mathdoc},
     volume = {19},
     number = {5},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1980_19_5_a1/}
}