1. Kodaira, K. in: Problems in Stellar Atmospheres and Envelopes (Baschek, B., Kegel, W.H., Traving, G., eds.) Springer, Berlin (1975) 149.
2. Olson, E.C.: Publ. Astron. Soc. Pac. 86 (1974) 80.
3. Matsushima, S.: Astrophys. J. 158 (1969) 1137.
4. Golay, M.: Introduction to astronomical photometry. Astrophys. Space Sci. Lib. 41, Reidel, Dordrecht (1974).
5. Straižys, V.: Multicolor stellar photometry. Photometric systems and methods. Mokslos Publ. Vilnius (1977).