1. Allen, C. W.: 1963, Astrophysical Quantities, Athlone Press, London
2. Antipova, L. I.: 1974, in G. Contoupolous (ed.), IAU Highlights of Astronomy, D. Reidel, Dordrecht, Holland, p. 501
3. Bath, G. T.: 1974, Monthly Notices Roy. Astron. Soc. 171, 311
4. Clayton, D. D.: 1968, Principles of Stellar Evolution and Nucleosynthesis, McGraw-Hill, New York
5. Cloutman, L. D. and Starrfield, S.: 1975 (in preparation)