1. Baker, N.H. and Gough D.O., 1979, Ap.J. 234, 232.
2. Christensen-Dalsgaard, J., 1986, Review, these proceedings.
3. Dicke, R.H., 1982, Nature 300, 693.
4. Dolez, N. and Gough, D.O., 1982, “Pulsations in Classical and Cataclysmic Variables”, eds. J.P. Cox and C.J. Hansen, Boulder, JILA, 248.
5. Dziembowski, W., 1977, Act. Astron. 27, 203.