1. O. Kofoed-Hansen and K.O. Nielsen, Dan. Mat. Fys. Medd. 26, n’7 (1951)
2. H.L. Rahvn, Nucl. Inst. Methods B70 (1990) 107
3. J. Sauvage et al., Hyperfine Interactions 129 (2000) 303
4. G. Bollen et al., Proceedings of the International Conference on Exotic Nuclei and Atomic Masses 1998, edited by B.M. Sherill, D.J. Morissey and C.N. Davids, AIP Conference Proceedings 455, Woodbury NY, 1998, p. 3
5. D. Lunney et al. in GB98 p.997