1. Aikin, A. C.: 1962a, International Symposium on Equatorial Aeronomy, Lima, Peru, September 25.
2. Aikin, A. C.: 1962b, Goddard Space Flight Center Report X-215-62-132.
3. Aono, Y., Hirao, K. and Miyazaki, S.: 1961, Journ. Rad. Res. Lab., Japan 8, 453.
4. Bates, D. R.: 1956, in: Solar Eclipses and the Ionosphere, Beynon and Brown, editors, Pergamon Press, p. 184.
5. Bates, D. R. and Patterson, T. N. L.: 1961, Plan. Space Sci. 5, 257.