1. R.P. Agarwal, Difference Equations and Inequalities, 2nd ed. (Dekker, New York, 2000).
2. Tech. Rep.;H. Brandén,2000
3. D.J. Cartwright, Underlying Principles of the Boundary Element Method (WIT Press, Southampton, 2001).
4. R.H. Chan and K.-P. Ng, Toeplitz preconditioners for Hermitian Toeplitz systems, Linear Algebra Appl. 190 (1993) 181?208.
5. C.S. Chen, M.D. Marcozzi and S. Choi, The method of fundamental solutions and compactly supported radial basis functions: A meshless approach to 3d problems, Int. Ser. Adv. Bound. Elem. 6 (1999) 561?570.