3) HANSEN, P. C. : Analysis of discrete ill-posed problems by means of the L-curve. SIAM Review 34 (1992), 561-580.
4) IMAI, H., TAKEUCHI, T. and SAKAGUCHI, H. : Infinite precision numerical simulation for pde systems and its applications. RIMS Kokyuroku, Kyoto University 1147 (2000), 42-50.
5) KRESS, R. : Linear integral equations. Springer (1989).