@article{FPM_2001_7_2_a9,
     author = {A. E. Pankratiev},
     title = {On quotients of hyperbolic products of groups},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {465--493},
     year = {2001},
     volume = {7},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2001_7_2_a9/}
}