1. Feldman, W. C., Asbridge, J. R., Bame, S. J., and Montgomery, M. D.: 1973,J. Geophys. Res. 78, 3697.
2. Fermisano, V.: 1969,J. Geophys. Res. 74, 355.
3. Fried, B. D. and Conte, S. D.: 1961,The Plasma Dispersion Function, Academic Press.
4. Hollweg, J. V. and V�lk, H. J.: 1970,J. Geophys. Res. 75, 5297.
5. Horng, J. T.: 1973,Proceedings of the Tenth International Symposium on Space Technology and Science, Tokyo, Japan, September 3?8, p. 1205.