1. Institute of Radioengineering and Electronics, Academy of Sciences of the U.S.S.R., Moscow 103907.
2. Institute of Applied Mathematics, Academy of Sciences of the U.S.S.R., Moscow 125047.
3. Institute of Geochemistry and Analytical Chemistry, Academy of Sciences of the U.S.S.R., Moscow 117975.
4. Central Research Institute of Geodesy, Aerosurvey, and Cartography, Moscow 125413.