1. Actions of Lie algebras on rings without nilpotent elements;Beidar;Algebra Colloq.,1995
2. Rings with Generalized Identities;Beidar,1996
3. Orthogonal completeness and algebraic system;Beidar;Uspekhi Mat. Nauk,1985
4. Remark on nilpotency of derivations;Chung;Proc. Japan Acad. Ser. A,1984
5. Nilpotency of derivations;Chung;Canad. Math. Bull.,1983