1. N. Tamura and J.-L. Verger-Gaugry, to be submitted to Philos. Mag. A, to be published.
2. Int. Symp. on the Physics and Chemistry of Finite Systems: From Clusters to Crystals;Verger-Gaugry,1991
3. N. Tamura, A. François, A. Loiseau and J.-L. Verger-Gaugry, submitted to Philos. Mag. B, to be published.
4. Bond-orientational order in liquids and glasses