@article{AL_2010_49_4_a4,
     author = {K. S. Sviridov},
     title = {Complementing a~finite subgroup of a~hyperbolic group by a~free factor},
     journal = {Algebra i logika},
     pages = {520--554},
     publisher = {mathdoc},
     volume = {49},
     number = {4},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2010_49_4_a4/}
}