1. Aggson, T. L.: 1969, in Atmospheric Emissions(ed. by B. M. McCormac and A. Omholt), Van Nostrand Reinhold Co., New York, p. 305.
2. Aggson, T. L. and Heppner, J. P.: 1964, A Proposal for Electric Field Measurements on the Gravity- Gradient ATS-A Satellite, NASA-Goddard Space Flight Center, Greenbelt, Maryland.
3. Aggson, T. L. and Heppner, J. P.: 1965, A Proposal for Electric Field Measurements on POGO Satellites, NASA-Goddard Space Flight Center, Greenbelt, Maryland.
4. Aggson, T. L., Maynard, N. C., and Heppner, J. P.: 1970, Characteristics of Magnetospheric Con-vection, presented at the 51. Annual Meeting of the Amer. Geophys. Union, Washington, D.C.
5. Akasofu, S.-I.: 1970, in Particles and Fields in the Magnetosphere(ed. by B. M. McCormac), Reidel Publ. Co., Dordrecht, Holland, p. 34.