EROs found behind lensing clusters - I. Stellar populations and dust properties of optical dropout EROs and comparison with related objectsD. Schaerer, A. Hempel, E. Egami, R. Pelló, J. Richard, J.-F. Le Borgne, J.-P. Kneib, M. Wise and F. BooneA&A, 469 1 (2007) 47-60DOI: https://doi.org/10.1051/0004-6361:20077127