1. O. Axelsson, Iterative Solution Methods, Cambridge University Press, Cambridge, 1994
2. I. Babuska, A. Aziz, Survey lectures on the mathematical foundations of the finite element method, in: A. Aziz (Ed.), The Mathematical Foundations of the Finite Element Method with Applications to Partial Differential Equations, Academic Press, New York, 1972, pp. 3–359
3. H. Brakhage, On ill-posed problems and the method of conjugate gradients, in: H. Engl, C. Groetsch (Eds.), Inverse and Ill-posed Problems, Academic Press, Boston, 1987, pp. 165–175
4. T. Chan, D. Keyes, G. Meurant, J. Scroggs, Proceedings of the Fifth International Symposium on Domain Decomposition Methods for Partial Differential Equations, SIAM, Philadelphia, 1992
5. T. Chan, R. Glowinski, J. Periaux, O. Widlund, Proceedings of the Third International Symposium on Domain Decomposition Methods for Partial Differential Equations, SIAM, Philadelphia, 1990