1. D. Marcuse, ?Theory of Dielectric Optical Waveguides? (Academic, New York, 1974), Chap. 5.
2. G. Perlis, ?Theory of Matrices? (Addison-Wesley, Cambridge, Mass., 1952), Chap. 9.
3. D. M. Young, ?Iterative Solution of Large Linear Systems? (Academic, New York, 1971), Chap. 1.
4. F. R. Gantmacher, ?Application of the Theory of Matrices? (Interscience, New York. 1959), Chap. 3.
5. J. H. Wilkinson, ?The Algebraic Eigenvalue Problem? (Clarendon Press, Oxford, 1965), Chap. 9.