, Free Rings and Their Relations, 1985.
Continuous time-varying linear systems, Systems & Control Letters, vol.35, pp.97-110, 1998. ,
On rings with one-sided field of quotients, Proc. Amer. Math. Soc, vol.11, issue.13, pp.380-384, 1960. ,
, Lectures on Modules and Rings, 1999.
, Noncommutative Noetherian Rings, cor, 2001.