Russell, C. T., Capaccioni, F., Coradini, A., Christensen, U., de Sanctis, M. C., Feldman, W. C., et al. (2006). Dawn discovery mission to Vesta and Ceres: Present status. Advances in Space Research, 38, 2043-2048. doi:10.1016/j.asr.2004.12.041.