1. G. Strang, Linear Algebra and Its Applications (Academic, New York, 1976).
2. A. E. Albert, Regression and the Moore–Penrose Pseudoinverse (Academic, New York, 1972).
3. N. I. Akhiezer and I. M. Glazman, The Theory of Linear Operators in Hilbert Space (Nauka, Moscow, 1966; Pitman, Boston, Mass., 1981).
4. S. K. Godunov, Solution of Systems of Linear Equations (Nauka, Moscow, 1980) [in Russian].
5. Kh. D. Ikramov, Nonsymmetric Eigenvalue Problem (Nauka, Moscow, 1991) [in Russian].