@article{DAN_1966_167_1_a6,
     author = {V. S. Makarov},
     title = {A certain class of discrete {Lobacevskii} space groups with an infinite fundamental region of finite measure},
     journal = {Doklady Akademii Nauk},
     pages = {30--33},
     publisher = {mathdoc},
     volume = {167},
     number = {1},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_167_1_a6/}
}