1. G. M. Bergman, Chains of prime ideals in R and prime ideals in R[[t]], unpublished.
2. Normalizing extensions, I;Bit-David,1980
3. Semiprime skew group rings;Fisher;J. Algebra,1978
4. Group rings of free products are primitive;Formanek;J. Algebra,1973
5. Strongly prime rings;Handelman;Trans. Amer. Math. Soc.,1975