1. S. A. Chunikhin, “Some trends in the development of the theory of finite groups in recent years,” Usp. Mat. Nauk,16, No. 4, 31–50 (1961).
2. S. A. Chunikhin, Subgroups of Finite Groups [in Russian], Nauka i Tekhnika, Minsk (1964).
3. M. I. Kargapolov, “Factorization of π-separable groups,” Dokl. Akad. Nauk SSSR,114, No. 6, 1155–1157 (1957).
4. M. I. Kargapolov, “On the π-factorization of finite groups,” Uch. Zap. Perm. Univ.,16, No. 3, 13–17 (1958).
5. M. I. Kargapolov, “Factorization of locally finite groups with finite classes of Sylow subgroups,” in: Proceedings of the Third All-Union Mathematical Congress [in Russian], Vol. 4, Akad. Nauk SSSR, Moscow (1959), pp. 9–10.