Non-LTE line formation for Pr ii and Pr iii in A and Ap stars L. Mashonkina, T. Ryabchikova, A. Ryabtsev and R. Kildiyarova A&A, 495 1 (2009) 297-311 Published online: 22 December 2008 DOI: 10.1051/0004-6361:200810258