1. Arnould, M. 1991, in Evolution of Stars: The Photospheric Abundance Connection, ed. G. Michaud and A. V. Tutukov 1991 (Dordrecht: Kluwer), p. xx
2. Becker S. A. 1981 in Physical Processes in Red Giants ed. I. Iben Jr. and A. Renzini (Dordrecht: Reidel) p. 14
3. Becker S. A., Iben, I. Jr., and Tuggle, R. S. 1977, ApJ, 218, 633
4. van den Bergh S., McClure R. D., and Evans, R. 1987, ApJ, 323, 44
5. Blanco B. M., McCarthy M. F., and Blanco, V. M. 1978, Nature, 271, 638