Lithium abundances of very low mass members of Chamaeleon I C. M. S. Johnas, E. W. Guenther, V. Joergens, A. Schweitzer and P. H. Hauschildt A&A, 475 2 (2007) 667-675 Published online: 17 September 2007 DOI: 10.1051/0004-6361:20077548