A new imprint of fast rotators: low C/C ratios in extremely metal-poor halo starsC. Chiappini, S. Ekström, G. Meynet, R. Hirschi, A. Maeder and C. CharbonnelA&A, 479 1 (2008) L9-L12DOI: https://doi.org/10.1051/0004-6361:20078698