1. D.D. Anderson, P.V. Danchev, A note on a theorem of Jacobson related to periodic rings, submitted.
2. D.D. Anderson, P.V. Danchev, Bounded periodic rings, submitted.
3. A.Y.M. Chin, H.V. Chen, On strongly π-regular group rings, Southeast Asian Bull. Math., 26 (2002), 387–390.
4. J. Cui, P. Danchev, Some new characterizations of periodic rings, J. Algebra & Appl., 19 (2020).
5. P.V. Danchev, Criteria for unit groups in commutative group rings, Studia Univ. Babeş Bolyai, Math., 51 (2006), No2, 43–61.