1. Afraimovich, S. R., Bazarzhapov, A. D., Mishin, V. M., Nemtsova, E. I., Osipov, N. K., Platonov, M. L. andUrbanovich, V. D. (1966), Mean Sq fields inferred from the data from September 1958. InGeomagn. Issledovania. Nauka (Moscow),8, 31?51.
2. Akimoto, S. andFujisawa, H. (1965),Demonstration of electrical conductivity jump produced by the olivinespinel transition. J. Geophys. Res.2 443?447.
3. Banks, R. J. (1969),Geomagnetic variations and the electrical conductivity of the upper mantle. Geophys. J. R. Astr. Soc.1?4, 457?487.
4. Banks, R. J. (1972),The overall conductivity distribution of the Earth. J. Geomag. Geoelectr.3, 337?351.
5. Ben'kova, N. P. (1941),Quiet solar diural variations of terrestrial magnetism. Proceedings of research bodies of the USSR Weather Service1, 75 pp.