1. J. Geophys. Res.,101, No. D6 1996.
2. K. P. Gaikovich and Sh. D. Kitai,Studies of the Earth from Space, No. 5, 54 (1982).
3. K. P. Gaikovich and Sh. D. Kitai, in:Proc. of 4th Soviet School on Propagation of Millimeter and Submillimeter Waves in the Atmosphere [in Russian], Nizhny Novgorod, 154 (1991).
4. K. P. Gaikovich, Sh. D. Kitai, and A. P. Naumov,Studies of the Earth from Space, No. 3, 73 (1994).
5. J. W. Waters,Proc. IEEE,80, No. 11, 1679 (1992).