1. Allen, C. W.: 1973, Astrophysical Quantities, London University Press, London.
2. Baijumanov, A. et al.: 1991, Solar Phys. 133, 51 (this issue).
3. Belmonte, J. A., Elsworth, Y., Isaak, G. R., New, R., Pallé, P. L., and Roca Cortès, T.: 1988, in E. J. Rolfe (ed.), Proc. Symp. Seismology of the Sun and Sun-like Stars, ESA SP-286, p. 177.
4. Ehgamberdiev, S., Khalikov, S., and Fossat, E.: 1991, Solar Phys. 133, 69 (this issue).
5. Grec, G. and Fossat, E.: 1979, Astron. Astrophys. 77, 352.