Ushakov Yu D

Publications in Math-Net.Ru

1. The ranks of the $p$-central series of free groups of certain manifolds
   
   Mat. Zametki, 22:4 (1977),  575–582
2. The free group of the commutator of two nilpotent varieties
   
   Sibirsk. Mat. Zh., 14:3 (1973),  636–650