Theoretical investigation of the ultrafast NeNePo spectroscopy of Au4 and Ag4 Clusters M. Hartmann, R. Mitrić, B. Stanca and V. Bonačić-Koutecký Eur. Phys. J. D, 16 1-3 (2001) 151-155 Published online: 15 September 2001 DOI: 10.1007/s100530170080