Rare earth based clusters for nanoscale light source B. Masenelli, P. Mélinon, D. Nicolas, E. Bernstein, B. Prével, J. Kapsa, O. Boisron, A. Perez, G. Ledoux, B. Mercier et al. (3 more) Eur. Phys. J. D, 34 1-3 (2005) 139-143 Published online: 13 July 2005 DOI: 10.1140/epjd/e2005-00104-y