1. S. I. Adian: The Burnside problem and identities in groups, Nauka, Moscow, 1975, 336 pp. Translated in: Ergebnisse der Mathematik und ihrer Grenzgebiete, 95, Springer-Verlag, Berlin-New York, 1979, 311 pp.
2. V. S. Atabekian: On simple and free periodic groups, Vestnik Moskovskogo Universiteta, Ser.1, Mathematics, Mechanics, no.6 (1987), 76–78 (in Russian).
3. S. V. Ivanov: On subgroups of the free Burnside groups of an odd composite exponent, Vestnik Moskovskogo Universiteta,Ser.l, Mathematics, Mechanics, no.2 (1989), 7–11 (in Russian).
4. A. I. Kostrikin: Around Burnside, Moscow, Nauka, 1986, 232 pp. (in Russian).
5. Kourovka Notebook. Unsolved Problems in Group Theory, 7th edition, Novosibirsk, 1980 (in Russian).