1. The geopotential representation by point masses;Balmino,1973
2. On the discrete boundary value problem in physical geodesy, report;Bjerhammar,1973
3. Discrete solutions of the boundary value problem in physical geodesy;Bjerhammar;Tellus,1975
4. Improved determinations of the earth's gravity field;Blaha,1979
5. Optimal estimation from data regularly sampled on a sphere with applications in geodesy;Colombo,1979