@article{SEMR_2007_4_a5,
     author = {N. V. Buskin},
     title = {Hyperbolicity of one-relator groups},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {85--102},
     publisher = {mathdoc},
     volume = {4},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2007_4_a5/}
}