1. Étude de l'effet de la composante Est-Quest du champ magnétique interplanétaire sur les courants équivalents aux perturbations magnétiques des régions de haute latitude;Berthelier;C. R. Acad. Sci., Ser. B,1972
2. Correspondence of solar field sector direction and polar cap geomagnetic field changes for 1965;Campbell;J. Geophys. Res.,1973
3. Friis-Christensen , E. The influence of the direction of the interplanetary magnetic field on the morphology of geomagnetic variations at high magnetic latitudes Charlottenlund, Denmark 1971
4. Polar-cap electric field distributions related to the interplanetary magnetic field direction;Heppner;J. Geophys. Res.,1972
5. Interplanetary magnetic-field direction and high-latitude ionospheric currents;Jørgensen;J. Geophys. Res.,1972