1. G. `t Hooft, Dimension Reduction in Quantum Gravity, in: A. Ali, J. Ellis, S. Randjbar-Daemi (Eds.), Salam festschrift: A collection of talks, World Scientific, 1993
2. The world as a hologram
3. J. Bekenstein, Phys. Rev. D 7 (1973) 2333; D 9 (1994) 3292; D 23 (1984) 1669.
4. Particle creation by black holes
5. W. Fischler, L. Susskind, Holography and Cosmology, hep-th/9806039.