Hyperfine-structure measurements and new levels evaluation in singly ionized praseodymium B. Furmann, D. Stefańska, E. Stachowska, J. Ruczkowski and J. Dembczyński Eur. Phys. J. D, 17 3 (2001) 275-284 Published online: 15 December 2001 DOI: 10.1007/s100530170001