1. Berman, C. and Goldburg, A.: 1972,Int. Conf. Aerospace and Aero. Meteorology, May 1972, Washington D.C., 194.
2. Bischof, W.: 1973,Water, Air, Soil Poll. 2, 3.
3. Brewer, A. W.: 1949,Quart. J. Roy. Met. Soc. 75, 351.
4. Burton, W. M. and Steward, N. G.: 1960,Nature 18b, 584.
5. Craig, R. A.: 1965,The Upper Atmosphere, Inter. Geophys. Ser. 8, Academic Press, New York.