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@article{MS_1991__182_4_a4, author = {{\CYRA}.{\CYRYU}. {\CYRO}{\cyrl}{\cyrsftsn}{\cyrsh}{\cyra}{\cyrn}{\cyrs}{\cyrk}{\cyri}{\cyrishrt}}, title = {{\CYRP}{\cyre}{\cyrr}{\cyre}{\cyro}{\cyrd}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyri}{\cyre} {\cyrf}{\cyra}{\cyrk}{\cyrt}{\cyro}{\cyrr}-{\cyrg}{\cyrr}{\cyru}{\cyrp}{\cyrp}{\cyrery} {\cyrg}{\cyri}{\cyrp}{\cyre}{\cyrr}{\cyrb}{\cyro}{\cyrl}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyri}{\cyrh} {\cyrg}{\cyrr}{\cyru}{\cyrp}{\cyrp}}, journal = {Matemati\v{c}eskij sbornik}, pages = {543--567}, publisher = {mathdoc}, volume = {182}, number = {4}, year = {1991}, zbl = {0820.20044}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1991__182_4_a4/} }
А.Ю. Ольшанский. Переодические фактор-группы гиперболических групп. Matematičeskij sbornik, Tome 182 (1991) no. 4, pp. 543-567. http://geodesic.mathdoc.fr/item/MS_1991__182_4_a4/