1. Inverse Problems in Differential Equations;Anger,1990
2. Inverse Problems: Principles and Applications in Geophysics, Technology, and Medicine,1993
3. Magnetische Felder und Kräfte;Diesselhorst,1939
4. Differential- und Integralrechnung;Fichtenholz,1972
5. Upward and downward continuations as inverse problems;Huestis;Geophys. J. R. Astr. Soc.,1979