1. Engl, H., M. Hanke, and A. Neubauer. 1996. Regularization of Inverse Problems. Dordrecht: Kluwer.
2. Groetsch, C.W. 1984. The Theory of Tikhonov Regularization for Fredholm Equations of the First Kind. London: Pitman.
3. Groetsch, C.W. 1993. Inverse Problems in the Mathematical Sciences. Braunschweig: Friedrich Vieweg und Sohn.
4. Groetsch, C.W., and J. Guacaneme. 1987. Arcangeli’s method for Fredholm interal equations of the first kind. Proceedings of the AMS 99: 2.
5. Groetch, C.W., and E. Schock. 1984. Asymptotic convergence rate of arcangeli’s method for iII-posed problems. Applicable Analysis 18: 3.