@article{IVM_1986_7_a2,
     author = {V. S. Guba},
     title = {Conditions under which 2-generated subgroups in small cancellation groups are free},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {12--19},
     year = {1986},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1986_7_a2/}
}