1. Akasofu, S.-I., Physics of the Magnetospheric Substorm, D. Reidel, Boston, 1977.
2. Alfvén, H., Some properties of magnetospheric neutral surfaces, J. Geophys. Res., 73, 4379–4381, 1968.
3. Alfvén, H., Electric durrent structure of the magnetosphere, in Physics of the Hot Plasma in the Magnetosphere, edited by B. Hultqvist and L. Stenfto, p. 1, Plenum Press, New York, 1975.
4. Alfvén, H. and C.-G. Falthammar, Cosmical Electrodynamics, Fundamental Principles, Clarendon Press, Oxford, 1963.
5. Andersson, D., M. Babic, S. Sandahl, and S. Torvén, On the maximum current carrying capacity ofa low pressure discharge, Proc. 9th Int. Conf. on Phenomena in Ionized Gases, Bucharest, Rumania, p. 142, 1969.