1. Ya. G. Berkovich,On the number of solutions of the equation x p k =a in a finite p-group, to appear.
2. Ya. G. Berkovich,A generalization of the theorems of Hall and Blackburn and their applications to nonregular p-groups, Math. USSR Izvestiya5 (1971), 815–844.
3. Ya. G. Berkovich,On p-groups of finite order, Siberian Math. J.9 (1968), 963–978.
4. Ya. G. Berkovich,Finite p-groups containing at most p p − 1Cyclic subgroups of order p n , Voprosy teorii grup i gomologicheskoi algebry2 (1979), Yaroslavl.
5. Ya. G. Berkovich, II, Matematicheski analis i ego prilozenia, Rostov University (1981), 10–16, Rostov-Don (in Russian).