1. Allum, E. R., Palmeira, R. A. R., Rao, U. R., and McCracken, K. G.: 1969, ?Solar Flare Electron Events Observed by IMP-F Satellites?, presented at XIth International Conference on Cosmic Rays, Budapest, Hungary.
2. Anderson, K. A.: 1969, Solar Phys. 6, 111.
3. Arnoldy, R. L., Kane, S. R., and Windeier, J. R.: 1968, Astrophys. J. 151, 711.
4. Burlaga, L. F.: 1969, ?Anisotropic Solar Cosmic Ray Propagation in an Inhomogeneous Medium II?, Goddard Space Flight Center Preprint, X-616-69-398.
5. Cline, T. L. and McDonald, F. B.: 1968, Solar Phys. 5, 507.