1. Böhm, K.-H.: 1963, Astrophys. J.
137, 881.
2. Clark, A. Jr.: 1966, Phys. Fluids
9, 485.
3. Kulikovskiy, A. G. and Lyubimov, G. A.: 1965, Magnetohydrodynamics. Addison-Wesley, Reading, Mass, p. 39.
4. Leighton, R. B.: 1965, in Stellar and Solar Magnetic Fields (ed. R. Lust), North-Holland Publ. Co., Amsterdam, p. 229.
5. Leighton, R. B., Noyes, R. W., and Simon, G. W.: 1962, Astrophys. J.
135, 474.