1. P. J. Kellogg, University of Minnesota Technical Report CR-69, (1964).
2. A note on the generation of the main-phase ring current of a geomagnetic storm
3. Solar Plasma Experiment
4. The solar wind velocity and its correlation with cosmic-ray variations and with solar and geomagnetic activity
5. B. Bridge, A. Egidi, A. Lazarus, E. Lyon, and L. Jacobson, in the Committee on Space Research (COSPAR) Meeting, Florence, Italy (1964).