1. Tikhonov, A.N. and Arsenin, V.Y., Solutions of Ill-Posed Problems, (John Willy & Sons, 1977 ).
2. Groetch, C.W., The Theory of Tikhonov Regularization for Fredholm Equations of the First Kind, (Martinus Nijhoff, 1984 ).
3. Lavrent’ev, Romonov, V.G. and Shishatshii, S.P., Ill-Posed Problems of Mathematical Physics and Analysis, (Amer. Math. Soc., 1986 ).
4. Kubo, S., Inverse Problems, (Baifukan, Tokyo, 1992 ).
5. Kubo, S. and Ohji, K., Applications of the Boundary Element Method to Inverse Problems, in: Applications of the Boundary Element Method ( Corona, Tokyo, 1987 ) pp. 181–198.