1. Alfvén, H. and Carlqvist, P.: 1967, Solar Phys. 1, 221.
2. Aferenko, E. V., Gaisinsky, I. M., and Oks, E. A.: 1986, 13th Int. Symp. on Phys. of Ionized Gases, Swansea, U.K., p. 488.
3. Amendt, P. and Benford, G.: 1989, Astrophys. J. 341, 1082.
4. Babin, A. N. and Koval, A. K.: 1983, Bull. Crimean Astrophys. Obs. 66, 89.
5. Bakshi, P. and Kalman, G.: 1976, Solar Phys., 47, 307.