1. Andriambahoaka Z., Schott J.J. and Ranaivonomenjanahary F., 2007. Repeat station data reduction using the CM4 model. Publ. Inst. Geophys. Pol. Acad. Sci., C-99(398), 242–249.
2. Barton C.E. and Newitt L.R., 1995. Regional Magnetic Survey, Chart, and Model Descriptions. Australian Geological Survey Organisation, Canberra, ACT, Australia.
3. Bendat J.S. and Piersol A.G., 2000. Random Data: Analysis and Measurement Procedures. John Wiley & Sons Inc., USA.
4. Blakely R.J., 1996. Potential Theory in Gravity and Magnetic Applications. Cambridge University Press, Cambridge, UK.
5. Campbell W.H., 1989. The regular geomagnetic-field variations during quiet solar conditions. In Jacobs J.A. (Ed.), Geomagnetism, Vol. 3. Academic Press, San Diego, USA, 385–460.