1. Primitive group rings;Lawrence,1973
2. On absolutely torsion-free rings and kernel functors;Viola-Prioli,1973
3. Strongly Prime and Completely Torsion-Free Rings;Goodearl,1974
4. Strongly prime rings;Handelman;Trans. Amer. Math. Soc.,1975
5. On uniformly strongly prime rings;van den Berg;Math. Jpn.,1993