1. Berezin, I. S. and Zhidkov, N. P.: 1962,Metody Vychisleniy, Tom I, GIFML, Moscow.
2. Blackman, R. B. and Tukey, J. W.: 1959,The Measurement of Power Spectra, Dover, New York.
3. Faddeyev, D. K. and Faddeyeva, V. N.: 1964,Vychislitel'nye Metody Lineynoy Algebry (Czech. translation), SNTL, Prague.
4. Handscomb, D. C.: 1965,Methods of Numerical Approximation, Pergamon Press.
5. Hohn, F. E.: 1960,Elementary Matrix Algebra, MacMillan, New York.