1. Fetter, L. A. and Hohenberg, P. C.: 1969, in: R. D. Parks (ed.),Superconductivity, Marcel Dekker, New York, p. 817.
2. Parker, E. N.: 1992, in: J. H. Thomas and N. O. Weiss (eds.),Sunspots: Theory and Observations, Kluwer Academic Publishers, Dordrecht, p. 413.
3. Saniga, M.: 1990a, ?On the Remarkable Similarity Between the Sunspot and the Type II Superconductor Magnetic Vortex?, Ph.D. Thesis, Bratislava (in English).
4. Saniga, M.: 1990b, ?Sunspots as Macroscopic Analogues of the Type II Superconductor Magnetic Vortices?, paper presented at the conferenceMechanisms of Chromospheric and Coronal Heating, Heidelberg, June 5?8, 1990.
5. Saniga, M.: 1992a,Astron. Zh. 69, 902.