@article{DAN_1978_241_4_a2,
     author = {N. A. Gusevskii},
     title = {On two classes of {Kleinian} groups},
     journal = {Doklady Akademii Nauk},
     pages = {753--756},
     publisher = {mathdoc},
     volume = {241},
     number = {4},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_241_4_a2/}
}