1. Axford, W. I., On the origin of radiation belt and auroral primary ions, in Particles and Fields in the Magnetosphere, edited by B. M. McCormac, p. 46, D. Reidel, Dordrecht, The Netherlands, 1969.
2. Balsiger, H., P. Eberhardt, J. Geiss, A. Ghielmetti, H. P. Walker, D. T. Young, H. Loidl, and H. Rosenbauer, A satellite-borne ion mass spectrometer for the energy range 0 to 16 keV, Space Sci. Inst., 2, 499, 1976.
3. Balsiger, H., P. Eberhardt, J. Geiss, and D. T. Young, Magnetic storm injection of 0.9 to 16-keV/e solar and terrestrial ions into the high-altitude magnetosphere, J. Geophys. Res., 85, 1645, 1980.
4. Bame, S. J., Spacecraft observations of the solar wind composition, in Solar Wind, edited by C. P. Sonett, P. J. Coleman, and J. M. Wilcox, p. 535, NASA SP-308, 1972.
5. Bame, S. J., A. J. Hundhausen, J. R. Asbridge, and I. B. Strong, Solar wind ion composition, Phys. Rev. Lett., 20, 393, 1968a.