First determination of the dynamical mass of a binary L dwarf H. Bouy, G. Duchêne, R. Köhler, W. Brandner, J. Bouvier, E. L. Martín, A. Ghez, X. Delfosse, T. Forveille, F. Allard et al. (4 more) A&A, 423 1 (2004) 341-352 Published online: 29 July 2004 DOI: 10.1051/0004-6361:20040551