1. Ageshin, P. N., Bayarevich, V. V., Stozhkov, Y. I., Charakhchyan, A. N., and Charakhchyan, T. N.: 1968, ‘The Proton Flares on July 7, September 2, 1966 and January 28, 1967’, Ann. IQSY 3, 282.
2. Alfvén, H. and Carlqvist, P.: 1967, Solar Phys. 1, 220.
3. Anderson, K. A.: 1969, ‘Electrons and Protons in Long-Lived Streams of Energetic Solar Particles’, Solar Phys. 6, 111.
4. Arnoldy, R. L., Kane, S. R., and Winckler, J. R.: 1968a, ‘The Observation of 10–50 keV Solar Flare X-Rays by the OGO Satellites and Their Correlation with Solar Radio and Energetic Particle Emission’, in IAU Symp. No. 35, p. 490.
5. Arnoldy, R. L., Kane, S. R., and Winckler, J. R.: 1968b, ‘An Atlas of 10–50 keV Solar Flare X-Rays Observed by the OGO Satellites, 5 September 1964 to 31 December 1966’, School of Physics and Astronomy, Univ. of Minnesota, CR-108.