1. N. Blackburn, “Some remarks on Cernikov p-groups,” Ill. J. Math.,6, 421–433 (1962).
2. P. S. Novikov and S. I. Adyan, “On infinite periodic groups,” Izv. Akad. Nauk SSSR, Ser. Mat.,32, No. 1, 2, 3 (1968).
3. V. G. Vilyatser, “On the theory of locally nilpotent groups,” Usp. Mat. Nauk,13, No. 2, 163–168 (1958).
4. E. S. Golod, “On null algebras and finitely approximated p-groups,” Izd. Akad. Nauk, Ser. Mat.,28, 273–276 (1964).
5. V. P. Shunkov, “On the power of a periodic group with Abelian 2-subgroups of finite ranks,” Algebra i Logika,8, No. 5, 601–618 (1969).