1. Ionization state of the interplanetary plasma;Hundhausen;J. Geophys. Res.,1968
2. The quiet corona: Temperature and temperature gradient;Bame;Solar Physics,1974
3. The effect of a non-Maxwellian electron distribution on oxygen and iron ionization balances in the solar corona;Owocki;Astrophys. J.,1983
4. Effects of non-Maxwellian electron velocity distribution functions and nonspherical geometry on minor ions in the solar wind;Bürgi;J. Geophys. Res.,1987
5. J. Geiss, F. Bühler, H. Cerutti, P. Eberhardt, and Ch. Filleux, Solar wind composition experiment, Apollo 16 Preliminary Sci. Report, NASA SP-315 (1972)