sentences:  with the thesis "Die gravimetrische Lotabweichungs-Berechnung in begrenzten Gebieten bei lückenhaftem Schwerematerial".Then in 1966 he received the title of Docent (Venia Legendi in Geodesy).His habilioration thesis was "Derivation of Green's Fundamental Formula for any one direction, leading to Integral equations and to Neumann's inverse boundary problem of Potential theory".