@article{VMUMM_1987_6_a18,
     author = {V. S. Atabekyan},
     title = {Simple and free periodic groups},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {76--78},
     year = {1987},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1987_6_a18/}
}