@article{AL_1978_17_1_a6,
     author = {S. V. Smirnov},
     title = {Approximations of mappings into a group},
     journal = {Algebra i logika},
     pages = {86--101},
     publisher = {mathdoc},
     volume = {17},
     number = {1},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1978_17_1_a6/}
}