1. B. Bruno, Gruppi in cui i sottogruppi propri contengono un sottogruppo nilpotente di indice finito. Boll. Un. Mat. Ital. (6)1, 179–188 (1984).
2. B. Bruno, On p-groups with nilpotent-by-finite proper subgroups. Boll. Un. Mat. Ital. A (7)3, 45–51 (1989).
3. B. Bruno andR. E. Phillips, On minimal conditions related to Miller-Moreno type groups. Rend. Sem. Mat. Univ. Padova69, 153–168 (1983).
4. D. J. S.Robinson, A course in the theory of groups. Berlin-Heidelberg-New York 1982.
5. D. J. S. Robinson andZ. R. Zhang, Groups whose proper quotients have finite derived subgroups. J. Algebra118, 346–368 (1988).