1. BGP (2000). Premier oil company gravity survey of Kalat, Pakistan, BGP crew 9501G final reports (internal), Bureau of Geophysical Prospecting (Pakistan) International, November, 2000
2. Farr TG, Kobrick M (2000) Shuttle radar topography mission produces a wealth of data. Am Geophys Union Eos 81:583–585
3. Featherstone W. E. (2002) “Report of IAG Special Study Group 3.177 Synthetic Modelling of the Earth’s Gravity Field (1999–2001),” Report of the IAG 3.177, Preprint from http://www.cage.curtin.edu.au/will/iags sg3 177.html . Millennium. Springer, Berlin Heidelberg New York, pp 163–171
4. Forsberg R (1984) Local covariance functions and density distributions. Report no.356. Dept. of Geodetic Science, Ohio State University, Columbus, Ohio
5. Forsberg R, Tscherning CC (1981) The use of height data in the gravity field approximation by collocation. September 10, 1981. JGR 86(B9):7843–7854