@article{VMUMM_1993_3_a17,
     author = {Yu. S. Semenov},
     title = {Some quotient groups of hyperbolic groups},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {88--90},
     publisher = {mathdoc},
     number = {3},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1993_3_a17/}
}