The isotopic 6Li/7Li ratio in Centaurus X-4 and the origin of Li in X-ray binaries J. Casares, P. Bonifacio, J. I. González Hernández, P. Molaro and M. Zoccali A&A, 470 3 (2007) 1033-1041 Published online: 16 May 2007 DOI: 10.1051/0004-6361:20066875