1. Amalgamation properties and interpolation theorems for equational theories;Bacsich;Algebra Universalis,1975
2. The diamond lemma in ring theory;Bergman;Advances in Math.,1978
3. Varieties of ω-algebras;Bol'hot;Algebra Y Logika,1970
4. Varieties of Ω-algebras
5. Varieties of quasigroups;Bol'hot;Sibirsk. Mat. Ž.,1972