1. The power-commutator structure of finite p-groups;Arganbright;Pacific J. Math.,1969
2. Analytic Pro-p Groups;Dixon,1999
3. G. Fernández-Alcober, Omega subgroups of powerful p-groups, private communication
4. A contribution to the theory of groups of prime-power order;Hall;Proc. London Math. Soc. (2),1933
5. L. Hethelyi, L. Levai, On elements of order p in powerful p-groups, J. Algebra, in press