1. S. A. Amitsur, "A general theory of radicals. II," Am. J. Math.,76, 100–125 (1954).
2. K. A. Zhevlakov, A. M. Slin'ko, I. P. Shestakov, and A. I. Shirshov, Nearly Associative Rings [in Russian], Nauka, Moscow (1978).
3. A. S. Markovichev, "Hereditariness of radicals of rings of type (γ, δ)," Algebra Logika,17, No. 1, 33–55 (1978).
4. A. A. Nikitin, "Hereditariness of radicals of rings," Algebra Logika,17, No. 3, 303–315 (1978).
5. A. A. Nikitin, "Lower radicals of some classes of rings," Algebra Logika,7, No. 5, 596–610 (1978).