1. A. O. Asar, “Locally nilpotent p-groups whose proper subgroups are hypercentral or nilpotent-by-Chernikov,” J. London Math. Soc., 61, 412–422 (2000).
2. R. Baer, “Situation der Untergruppen und Struktur der Gruppe,” Sitzgsber. Heidelberg. Akad. Wiss., 2, 12–17 (1933).
3. S. N. Chernikov, “Infinite groups with prescribed properties of their systems of infinite subgroups,” Dokl. Akad. Nauk SSSR,, 159, 759–760 (1964).
4. S. N. Chernikov, “Groups with given properties of systems of infinite subgroups,” Ukr. Mat. Zh., 19, 111–131 (1967).
5. S. N. Chernikov, “Investigations of groups with given properties of subgroups,” Ukr. Mat. Zh., 21, No. 2, 193–209 (1969).