Accurate masses of unstable rare-earth isotopes by ISOLTRAP D. Beck, F. Ames, G. Audi, G. Bollen, F. Herfurth, H. -J. Kluge, A. Kohl, M. König, D. Lunney, I. Martel et al. (7 more) Eur. Phys. J. A, 8 3 (2000) 307-329 Published online: 15 September 2000 DOI: 10.1007/s100500070085