Trakhtman Avraam Naumovich

Publications in Math-Net.Ru

1. AЁvariety of semigroups without an irreducible basis for identities
   
   Mat. Zametki, 21:6 (1977),  865–872
2. Subsemigroup graphs, and lattices of subsemigroups
   
   Izv. Vyssh. Uchebn. Zaved. Mat., 1976, no. 2,  69–78
3. Covering elements in the lattice of varieties of algebras
   
   Mat. Zametki, 15:2 (1974),  307–312