@article{CHEB_2002_3_1_a3,
     author = {N. B. Bezverkhnyaya},
     title = {Description of hyperbolic and nonhyperbolic groups that are certain $HNN$-extensions of free groups},
     journal = {\v{C}eby\v{s}evskij sbornik},
     pages = {17--31},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHEB_2002_3_1_a3/}
}