1. The induction of electric currents in a non-uniform ionosphere;Ashour,1948
2. Induction in arbitrary shaped oceans IV: Sq for simple case;Beamish;Geophys. J.R. Astron. Soc.,1980
3. Quiet Solar Diurnal Variations of Terrestrial Magnetism;Benkova,1941
4. Electromagnetic induction in the oceans;Bullard,1970
5. The ocean effect in Dst variations;Fainberg,1975