1. Monorniality of groups;Bioch,1975
2. The classification of primo-power groups;Hall;J. reine and ang. Math,1940
3. Verbal and marginal subgroups;Hall;J. reine and ang. Math,1940
4. Endliche Gruppen I;Huppert,1967
5. haracter Ramification and M-Groups;Price;Math Zeits.,1973