1. Handbook of Mathematical Functions, M., Abramowitz, , I. A., Stegun, , Dover, New York, 1970,
2. Asymptotically fast solution of Toeplitz and related systems of linear equations;Bitmead;Linear Algebra Its Appl.,1980
3. On the foundation of collocation in physical geodesy;Bjerhammer;Bull. Geod.,1982
4. Least squares prediction and filtering in any dimension using the principles of array algebra;Blaha;Bull. Geod.,1977
5. Optimal estimation from data regularly sampled on a sphere with applications in geodesy;Colombo,1979