1. Allen, C. W.: 1973,Astrophysical Quantities (3rd ed.), The Athlone Press, London.
2. Amnuel, P. R., Guseinov, O. H., and Rakhamimov, Sh. Yu.: 1982,Astrophys. Space Sci. 82, 3.
3. Anisimova, G. B.: 1984, in K. A. Barkhatova et al. (eds.)Questions of Astrophysics, Mordovskii Univ. Press, Saransk, p. 25 (in Russian).
4. Ardeberg, A., Lindgren, H. and Maurice, E.: 1984, in ?Local Interstellar Medium?,IAU Colloq. 81, 109.
5. Arnaud, M., Rothenflug, R., and Rocchia, R.: 1984, in ?Local Interstellar Medium?,IAU Colloq.81, 301.