Differentiation of the asteroid Ceres as revealed by its shape - Parker, J. Wm.; McFadden, L. A.; Russell, C. T.; Stern, S. A.; Sykes, M. V.; Young, E. F.; Thomas, P. C. (Nature Publishing Group, 2005)
http://dx.doi.org/10.1038/nature03938
Keywords: W; V; WW-YZ; TA-TD; U