1. The hierarchy problem and new dimensions at a millimeter
2. Quantum gravity and extra dimensions at high-energy colliders
3. T. Han, J.D. Lykken, R-J. Zhang, hep-ph/9811350.
4. J.L. Hewett, hep-ph/9811356.
5. S. Nussinov, R. Shrock, hep-ph/9811323; P. Mathews, S. Raychaudhuri, K. Sridhar, hep-ph/9811501 and hep-ph/9812486; T.G. Rizzo, hep-ph/9901209 and hep-ph/9902273.