TOPoS - I. Survey design and analysis of the first sample E. Caffau, P. Bonifacio, L. Sbordone, P. François, L. Monaco, M. Spite, B. Plez, R. Cayrel, N. Christlieb, P. Clark et al. (7 more) A&A, 560 (2013) A71 Published online: 06 December 2013 DOI: 10.1051/0004-6361/201322488