1. Large Abelian subgroups of p-groups;Alperin;Trans. Amer. Math. Soc.,1965
2. Subgroups, normal subgroups and epimorphic images of a p-group of finite order;Berkovic;Sov. Math. Dokl.,1969
3. Subgroup and normal structure of a finite p-group;Berkovic;Sov. Math. Dokl.,1971
4. On a nonregular p-group;Berkovic;Siberian Math. J.,1971
5. Solvability of groups of odd order;Feit;Pacific J. Math.,1963