1. Certains anneaux périodiques;Chacron;Bull. Soc. Math. Belg.,1968
2. On quasi periodic rings;Chacron;J. Algebra,1969
3. On a Theorem of Herstein;Chacron;Can. J. Math.,1969
4. A note on rings with central nilpotent elements;Herstein,1954
5. Non Commutative Rings;Herstein,1968