The s-process in the Galactic halo: the fifth signature of spinstars in the early Universe? G. Cescutti, C. Chiappini, R. Hirschi, G. Meynet and U. Frischknecht A&A, 553 (2013) A51 Published online: 30 April 2013 DOI: 10.1051/0004-6361/201220809