Geodesic
A generalization of the theorems of Hall and Blackburn and their applications to nonregular $p$-groups
Izvestiya. Mathematics, Tome 5 (1971) no. 4, pp. 815-844 
Ya. G. Berkovich. A generalization of the theorems of Hall and Blackburn and their applications to nonregular $p$-groups. Izvestiya. Mathematics, Tome 5 (1971) no. 4, pp. 815-844. http://geodesic.mathdoc.fr/item/IM2_1971_5_4_a5/
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     title = {A~generalization of the theorems of {Hall} and {Blackburn} and their applications to nonregular $p$-groups},
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Voir la notice de l'article provenant de la source Math-Net.Ru

In this work we improve Philip Hall's estimate for the number of cyclic subgroups in a finite $p$-group. From our result it follows that if a $p$-group $G$ is not absolutely regular and not a group of maximal class, then 1) the number of solutions of the equation $x^p=1$ in $G$ is equal to $p^p + k(p-1)p^p$, where $k$ is a nonnegative integer; 2) if $n>1$, then the number of solutions of the equation $x^{p^n}=1$ in $G$ is divisible by $p^{n+p-1}$. This permits us to strengthen important theorems of Hall and Norman Blackburn on the existence of normal subgroups of prime exponent. The latter results in turn permit us to give a factorization of $p$-groups with absolutely regular Frattini subgroup. Another application is a theorem on the number of subgroups of maximal class in a $p$-group.

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