Non-LTE line formation for heavy elements in four very metal-poor stars L. Mashonkina, G. Zhao, T. Gehren, W. Aoki, M. Bergemann, K. Noguchi, J. R. Shi, M. Takada-Hidai and H. W. Zhang A&A, 478 2 (2008) 529-541 Published online: 04 December 2007 DOI: 10.1051/0004-6361:20078060