1. Aitchison, J., , J. A. C., Brown, , The Log-normal Distribution and Special Reference to its Use in Economics, Cambridge University Press, Cambridge, 1957,
2. The ring current, geomagnetic disturbance and the Van Allen radiation belts;Akasofu;J. Geophys. Res.,1961
3. Field levels near midnight at low and equatorial geomagnetic stations;Campbell;J. Atmos. Terr. Phys.,1973
4. Geomagnetic storms, the Dst ring-current myth, and lognormal distributions;Campbell;J. Atmos. Terr. Phys.,1996
5. Response of the thermosphere and ionosphere to geomagnetic storms;Fuller-Rowell;J. Geophys. Res.,1994