1. The characterization of (−1, 1) rings;Hentzel;J. Algebra,1974
2. Nil semi-simple locally (−1, 1) rings;Hentzel;Bull. Iranian Math. Soc.,1981
3. Alternative nil rings;Kleinfeld;Ann. of Math.,1957
4. On simple right alternative rings;Miheev;Algebra i Logika,1977
5. An Introduction to Nonassociative Algebras;Schafer,1966