1. Anzer, U.: 1989, in E. R. Priest (ed.), Dynamics and Structure of Quiescent Solar Prominences, Kluwer Academic Publishers, Dordrecht, p. 143.
2. Apushkinski, G. P.: 1988, Soviet Astron. 32 (6), 688.
3. Biskamp, D. and Welter, H.: 1989, Solar Phys. 120, 49.
4. Chiuderi-Drago, F., Mein, N., and Pick, M.: 1986, Solar Phys. 103, 235.
5. d'Azambuja, L. and d'Azambuja, M.: 1948, Ann. Obs. Paris 6, 7.