@article{INTF_1988_29_a1,
     author = {\`E. B. Vinberg and O. V. Schwarzman},
     title = {Discrete groups of motions of spaces of constant curvature},
     journal = {Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Fundamental'nye Napravleniya },
     pages = {147--259},
     publisher = {mathdoc},
     volume = {29},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTF_1988_29_a1/}
}