1. Brun, A.S.: 2004, Solar Phys. 220, 333 – 345.
2. D’Azambuja, M., D’Azambuja, L.: 1948, Ann. Obs. Paris 6, 1 – 278.
3. DeRosa, M.L., 2005, In: Sankarasubramanian, K., Penn, M., Pevtsov, A. (eds.) Conference Large-scale Structures and Their Role in Solar Activity 346, Astron. Soc. Pac., San Francisco, 337 – 352.
4. Durrant, C.J., Turner, J., Wilson, P.R.: 2002, Solar Phys. 211, 103 – 124.
5. Gigolashvili, M.Sh., Japaridze, D.R., Kukhianidze, V.J.: 2005a, Solar Phys. 231, 23 – 28.