References
- CHAPMAN, S., and BARTELS, J., 1940: Geomagnetism, Oxford.
- DYSON, F. W., and FURNER, H., 1923: The Earth's Magnetic Potential, Month. Not. R.A.S., London, Geophys. Suppl., I, P. 76.
- LEVY, H., and BAGGOTT, E. A., 1934: Numerical Studies in Differential Equations, London.
- VESTINE, E. H., LANGE, I., LAPORTE, L., and SCOTT, W. E., 1947: The Geomagnetic Field, Its Description and Analysis. Cam. Inst. Wash. Publ. 580.