Demeo, F., Fornasier, S., Barucci, A., Perna, D., Protopapa, S., Alvarez-Candal, A., et al. (2009). Visible and near-infrared colors of Transneptunian objects and Centaurs from the second ESO large program. Astronomy and Astrophysics, 493, 283-290. doi:10.1051/0004-6361:200810561.