1. Price, J. C. (1987). Proc. Int. Symposium on Experimental Gravitational Physics, P. Michelson, H. En-Ke, G. Pizzella, eds. (D. Reidel, Dordrecht).
2. For a recent review, see Kaplan, D. B. (1995). Preprint DOE-ER-40561-205, nuclth/9506035.
3. Efstathiou, G., Sutherland, W. J., and Maddox, S. J. (1990). Nature 348, 705; Turner, M. S. (1991). Phys. Scripta T36, 167; Krauss, L. M., and Turner, M. S. (1995). Preprint CWRU-P6-95, astro-ph/9504003.
4. Banks, T. (1988). Nucl. Phys. B309, 493, and Susskind, L. unpublished, referred to therein.
5. See, for example, Donoghue, J. F. (1994). Phys. Rev. D50, 3874.