Journal article published in 2007 by C. T. M A. Barucci R P. Binzel M T. Capria U Christensen A Coradini M C. De Sanctis W C. Feldman R Jaumann H U. Keller A S. Konopliv T B. McCord L A. McFadden K D. McKeegan H Y. McSween S Mottola A Nathues G Neukum C M. Pieters T H. Prettyman C A. Raymond Russell