1. Schatzman, E. Ann. Astrophys. 25, 18–29 (1962).
2. Schatzman, E. Astrophys. Lett. 3, 139–140 (1969).
3. Zan, J.-P. in Stellar Stability and Evolution (eds Ledoux, P., Noels, A. & Rogers, A. W.) 185 (Reidel, Dordrecht, 1974).
4. Hart, J. E. A. Rev. Fluid Mech. 11, 147–172 (1979).
5. Knobloch, E. & Spruit, H. C. Astr. Astrophys. (submitted).