1. Abraham-Shrauner, B.: 1968,J. Geophys. Res. 73, 6299.
2. Becker, E.: 1966,Gasdynamik, Teubner, Stuttgart.
3. Bertotti, B., Parkinson, D., Schindler, K., and Goldberg, P.: 1972, in K. Schindler (ed.),Cosmic Plasma Physics, Plenum Press, New York, p. 319.
4. Chew, G. F., Goldberger, M. L., and Low, F. E.: 1956,Proc. Roy. Soc. A236, 112.
5. Chu, C. K. and Gross, R. A.: 1969, inAdvances in Plasma Physics, Vol. 2 (ed. by A. Simon and W. B. Thompson), Interscience Publ., New York, p. 139.