The influence of O and C doping on the ionization potentials of Li-clusters F. Despa, W. Bouwen, F. Vanhoutte, P. Lievens and R. E. Silverans Eur. Phys. J. D, 11 3 (2000) 403-411 Published online: 15 September 2000 DOI: 10.1007/s100530070069