1. Derivations in simple rings;Amitsur, S. A.;Proc. London Math. Soc. (3),1957
2. Lie simplicity of a special class of associative rings;Baxter, Willard E.;Proc. Amer. Math. Soc.,1956
3. On invariant subrings;Hattori, Akira;Jpn. J. Math.,1951
4. The Lie ring of a simple associative ring;Herstein, I. N.;Duke Math. J.,1955
5. A note on the total matrix ring over a noncommutative field;Hua, Loo-Keng;Ann. Soc. Polon. Math.,1952