1. On Azumaya algebras and finite-dimensional representations of rings;Ahtin;J. Algebra,1969
2. The Brauer groups of a commutative ring;Auslander;Trans. Amer. Math. Soc.,1960
3. I. N. Herstein, “Noncommutative Rings,” Carus Math. Monographs, No. 15.
4. Structure of Rings;Jacobson,1964
5. Noncommutative affine rings;Procesi;Mem. Acc. Naz. Lincei,1967