1. A. Giveon, M. Porrati, and E. Rabinovici, Phys. Rep. 244, 79 (1994).
2. E. Alvarez, L. Alvarez-Gaume, and Y. Lozano, preprint CERN-TH. 7486/94, E-print archives hep-th/9410237.
3. In Essays on Mirror Manifolds, ed. by S. T. Yau, International Press, Hong Kong (1991).
4. D. R. Morrison and M. R. Plesser, Nucl. Phys. B 440, 279 (1995).
5. V. Batyrev and L. A. Borisov, E-print archives alg-geom/9412017.