1. J. Jortner , D.Scharf, N.Ben-Horin, U.Even and U.Landman, in The Chemical Physics of Atomic and Molecular Clusters, ed. G. Scoles, North-Holland, Amsterdam, 1990, p. 43
2. S. R. Berry , in The Chemical Physics of Atomic and Molecular Clusters, ed. G. Scoles, North Holland, Amsterdam, 1990, p. 23
3. Negative Heat Capacity for a Cluster of 147 Sodium Atoms