Collective Excitation in Silver Cluster Ions
J. Tiggesbäumker, L. Köller, H. O. Lutz, K.-H. Meiwes-Broer, in: P. Jena, S. N. Khanna, B. K. Rao (Eds.), Physics and Chemistry of Finite Systems: From Clusters to Crystals, Springer, Dordrecht, 1992, pp. 1001–1006.