1. Chiu, H.-Y., and Canuto, V., Phys. Rev. Lett., (in the press).
2. Canuto, V., Chiu, H.-Y., and Fassio-Canuto, L., Phys. Rev. (in the press).
3. Chiu, H.-Y., and Fassio-Canuto, L., Phys. Rev. (in the press).
4. Maran, S. P., and Cameron, A. G. W., Physics Today, 21 (8), 41 (1968).
5. Cocke, W. J., Disney, M. J., and Taylor, D. J., IAU Circ. No. 2128 (1969).