1. GPIs having coefficients in Utumi quotient rings;Chuang,1988
2. ∗-Differential identities of prime rings with involution;Chuang;Trans. Amer. Math. Soc.,1989
3. Lectures on Injective Modules and Quotient Rings;Faith,1967
4. Structure of Rings;Jacobson,1984
5. Lectues in Abstract Algebra (II);Jacobson,1953