1. Lectures in Abstract Algebra, Vol. II, Linear Algebra;Jacobson,1953
2. On the characteristic roots of matric polynomials;McCoy;Bull. Amer. Math. Soc.,1936
3. Commutators of A and A∗;Kato;J. Wash. Acad. Sci.,1956
4. Linear relations between higher additive commutators;Taussky;Proc. Amer. Math. Soc.,1962
5. Lectures in Abstract Algebra, Vol. I, Basic Concepts;Jacobson,1951