@article{SM_1969_7_2_a4,
     author = {V. A. Kuz'menchuk},
     title = {On~exact operations on~a~class of topological groups},
     journal = {Sbornik. Mathematics},
     pages = {251--272},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {1969},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1969_7_2_a4/}
}