1. See for example: Physics and Chemistry of Small Clusters,P. Jena, B. K. Rao, and S. N. Khanna, Eds., Plenum Press: New York, 1987; Adv. Chem. Phys. I. Prigogine, and S. A. Rice, Eds., 10, Part 2, Wiley-Interscience: New York, 1988; Elemental and Molecular Clusters,G. Benedek, T. P. Martin, and G. Pacchioni, Eds., Springer: Berlin, 1988; and references therein.
2. J. Jellinek and Z. B. Güvenç, this volume; S. J. Riley and E. Parks, this volume.
3. S. Sawada and S. Sugano, Z. Phys. D. 14, 247 (198)
4. F. Ercolessi, W. Andreoni, and E. Tossatti, Phys. Rev. Lett. 66 911 (1991)
5. A. Bulgac and D. Kusnezov, Phys. Rev. B (in press).