1. Ahmad, I. A.: 1976, Bull. Am. Astron. Soc. 8, 325.
2. Ahmad, I. A.: 1977a, Solar Phys. 53, 409.
3. Ahmad, I. A.: 1977b, Topical Conference on Solar and Interplanetary Physics, Tucson, 12?15 January, 1977, Book of Abstracts, p. 7.
4. Ahmad, I. J. A. and Withbroe, G. L.: 1977, Solar Phys. 53, 397.
5. Bame, S. J., Asbridge, J. R., Feldman, W. C., and Gosling, J. T.: 1977, J. Geophys. Res. 82, 1487.