@article{AL_2013_52_3_a3,
     author = {F. A. Dudkin and K. S. Sviridov},
     title = {Complementing a~subgroup of a~hyperbolic group by a~free factor},
     journal = {Algebra i logika},
     pages = {332--351},
     publisher = {mathdoc},
     volume = {52},
     number = {3},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2013_52_3_a3/}
}