Pogrebinskii B M

Publications in Math-Net.Ru

1. Normal subgroups of finite groups
   
   Sibirsk. Mat. Zh., 17:1 (1976),  141–147
2. The $\Theta$-length of a finite group
   
   Izv. Vyssh. Uchebn. Zaved. Mat., 1973, no. 12,  57–63