1. Deb, S., J. Atm. Phys., 2:309 (1957).
2. 2.Nicolet, M., Aeronomy [Russian translation], Izd. Mir, Moscow (1964).
3. J. Geoph. Res., 65:1622 (1960).
4. Nicolet, M., Report of the Gassiot Committee, London (1947).
5. Herzberg, G., and Herzberg, L., Nature, 161:283 (1948).