1. Allen, M. S., and Cowley, C. R. 1974, Ap. J., 190, 601.
2. Bell, R. A. 1984, unpublished dwarf models.
3. Bell, R. A., Erickson, K., Gustafsson, B., and Nordlund, 1976, Astron. and Ap. Suppl., 23, 37.
4. Cayrel, R., and Cayrel, G. 1963, Ap. J., 137, 431.
5. Clayton, D. D., and Ward, R. A. 1974, Ap. J., 193, 397.