1. H.B. Keller, Numerical Methods for Two-Point Boundary-Value Problems (Blaisdell Publishing Company, Waltham, 1968)
2. U.M. Ascher, R.M.M. Mattheij, R.D. Russell, Numerical Solution of Boundary Value Problems for Ordinary Differential Equations (SIAM, Philadelphia, 1995); See also U. Ascher, R.D. Russell, SIAM Rev. 23, 238 (1981)
3. E. Isaacson, H.B. Keller, Analysis of Numerical Methods (Wiley, New York, 1966)
4. P. Henrici, Discrete Variable Methods in Ordinary Differential Equations (Wiley, New York, 1962)
5. P. Henrici, Error Propagation for Difference Methods (Wiley, New York, 1963)