1. I. Babuska, M. Prager, andE. Vitasek,Numerical Processes in Differential Equations, John Wiley (Interscience Publishers) New York (1966).
2. V. N. Faddeeva,Computational Methods of Linear Algebra, Translated by C. D. Benster, Dover Publications, New York (1959).
3. L. Fox,The Numerical Solution of Two-Point Boundary Value Problems in Ordinary Differential Equations, Oxford University Press, London (1957).
4. G. H. Hardy, J. E. Littlewood, andG. Polya,Inequalities, Cambridge University Press, London and New York (1952).
5. P. Henrici,Discrete Variable Methods in Ordinary Differential Equations, John Wiley, New York (1962).