@article{MT_1996_30_a10,
     author = {V. A. Churkin},
     title = {Wide ends of finitely-generated groups},
     journal = {Matemati\v{c}eskie trudy},
     pages = {186--188},
     year = {1996},
     volume = {30},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1996_30_a10/}
}