1. A survey of observational knowledge of the geomagnetic pulsation;Kato;Sci. Rep. Tohoku Univ., Ser. 5, Geophys.,1957
2. papers presented by Japanese scientists at the Symposium on Rapid Geomagnetic Variations,1959
3. Short period oscillations of geomagnetic field. I.A.G.A.;Afanasieva,1959
4. Time relationship of small magnetic disturbances in the Arctic and Antarctic;Ahmed;J. Geophys. Res.,1955