Multiplicity of very low-mass objects in the Upper Scorpius OB association: a possible wide binary populationH. Bouy, E. L. Martín, W. Brandner, M. R. Zapatero-Osorio, V. J. S. Béjar, M. Schirmer, N. Huélamo and A. M. GhezA&A, 451 1 (2006) 177-186DOI: https://doi.org/10.1051/0004-6361:20054252