Key points are not available for this paper at this time.
A. Kurosh, Ringtheoretische Probleme die mit dem Burnsideschen Problem uber periodische Gruppen in Zussammenhang stehen, Bull. Acad. Sei. URSS, Ser. Math. vol. 5 (1941) pp. 233-240. 8. J. Levitzki, On the radical of a general ring, Bull. Amer. Math. Soc. vol. 49 (1943) pp. 462⁶6. 9. -, On three problems concerning nil rings, Bull. Amer. Math. Soc. vol. 49 (1943) pp. 913-919. 10. -, On the structure of algebraic algebras and related rings, Trans. Amer. Math. Soc. vol. 74 (1953) pp. 384-409.
Joseph B. Kruskal (Wed,) studied this question.