Constraints on rotational mixing from surface evolution of light elements in massive stars U. Frischknecht, R. Hirschi, G. Meynet, S. Ekström, C. Georgy, T. Rauscher, C. Winteler and F.-K. Thielemann A&A, 522 (2010) A39 Published online: 29 October 2010 DOI: 10.1051/0004-6361/201014340