Proceedings of the American Mathematical Society
On the shortest spanning subtree of a graph and the traveling salesman problem
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7. 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. 462^66. 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.
DOI: 10.1090/s0002-9939-1956-0078686-7 · Publisher: American Mathematical Society (AMS)