1. Parker, E. N...Phys. Rev., 1958,110, 1445;Interplanetary Dynamical Processes, Interscience Publishers, New York (1963).
2. Dorman, L. I...Proceedings of the International Conference on Cosmic Rays Moscow, 1960,4, 320.
3. Webber, W. Review articleProgress in Elementary Particle and Cosmic Ray Physics, North Holland Publishing Company, Amsterdam, 1962,6.
4. Apparao, M. V. K. and Kaplon, M. F.Nuovo Cim., 1963,27, 700.
5. Apparao, M. V. K. ..Ibid. (In print).