NLTE strontium abundance in a sample of extremely metal poor stars and the Sr/Ba ratio in the early GalaxyS. M. Andrievsky, F. Spite, S. A. Korotin, P. François, M. Spite, P. Bonifacio, R. Cayrel and V. HillA&A, 530 (2011) A105DOI: https://doi.org/10.1051/0004-6361/201116591
