1. Rational methods in matrix equations;Ingraham, Mark H.;Bull. Amer. Math. Soc.,1941
2. C. C. MacDuffee, The theory of matrices, Ergebnisse der Mathematik und ihrer Grenzgebiete, New York, Chelsea, 1946, pp. 31-36.
3. Left associates of monic matrices, with an application to unilateral matrix equations;Bell, James H.;Amer. J. Math.,1949
4. On the unilateral equation in matrices;Roth, William E.;Trans. Amer. Math. Soc.,1930
5. Families of solutions of the unilateral matrix equation;Bell, James H.;Proc. Amer. Math. Soc.,1950