1. Alfvén, H. and Fälthammar, C. G.: 1963,Cosmical Electrodynamics, Clarendon Press, Oxford.
2. Barnes, A.: 1969,Astrophy J. 155, 311.
3. Barnes, A. and Suffolk, G. C. J.: 1971,J. Plasma Phys. 5, 315.
4. Belcher, J. W. and Davis, L., Jr.: 1971,J. Geophys. Res. 76, 3534.
5. Bercovitz, M.: 1971,Proc. 12th. Int. Conf. on Cosmic Rays, Hobart,2, MOD-12, 579.