1. Arter, W.: 1983a, J. Fluid Mech. 132, 25
2. Arter, W.: 1983b, in J. O. Stenflo (Ed.), Solar and Stellar Magnetic Fields: Origins and Coronal Effects ,Proc. IAU Symp. 102, Reidel, Dordrecht, p. 243
3. Arter, W.: 1985, Geophys. Astrophys. Fluid Dyn. 31, 311
4. Babcock, H. W.: 1961, ApJ 133, 572
5. Cattaneo, F., Hughes, D. W., and Proctor, M. R. E.: 1988, Geophys. Astrophys. Fluid Dyn. 41, 335