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2. Davis, L. R., Berg, O. E., and Meredith, L. H.: 1961, ?Direct Measurements of Particle Fluxes in and near Auroras?, in Space Research, I (ed. by H. Kallmannijl). North-Holland Publishing Co., Amsterdam, pp. 721?735.
3. Evans, J. E., Johnson, R. G., Reagan, J. B., and Sharp, R. D.: 1964a, ?Low-energy Proton and Electron Precipitation in the Auroral Zones?, Trans. Amer. Geophys. Union 45, 581, 595.
4. Evans, J. E., Johnson, R. G., Sharp, R. D., and Reagan, J. B.: 1964b, ?Precipitated Proton Fluxes at 300-km Altitude over the Auroral Zones?, Trans. Amer. Geophys. Union 45, 41.
5. Evans, J. E., Joki, E. G., Johnson, R. G., and Sharp, R. D.: 1965, ?Austral and Boreal Auroral Zone Precipitation Patterns for Low-Energy Protons?, Sixth International Space Science Symposium of COSPAR, May 13?19, 1965, Mar del Plata, Argentina (to be published in Space Research, VI).