Reference List for the HST images, albedo maps, and shape of (1) Ceres bundle
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Burrows, C.J., J.A. Holtzman, S.M. Faber, P.Y. Bely, H. Hasan, C.R. Lynds, and D. Schroeder,
'The imaging Performance of the Hubble Space Telescope', 
Ap. J. Lett., 369, L21- L25, 1991. doi:  10.1086/185950 doi:10.1086/185950

Li, J.-Y., McFadden, L. A., Parker, J. Wm., Young, E. F., Stern, S. A., Thomas, P. C., Russell, C. T., 
Sykes, M. V., Photometric analysis of 1 Ceres and surface mapping from HSTobservations, 
Icarus 182, 143-160, 2006. doi: 10.1016/j.icarus.2005.12.012

Pavlovsky, C., Koekemoer, A., Mack, J., Gilliland, R., Riess, A., and 21 others, 
ACS Data Handbook, Version 4.0, STScI, Baltimore, 2005.

Thomas, P. C., Parker, J. Wm., McFadden, L. A., Russell, C. T., Stern, S. A., Sykes, M. V., Young, E. F., Differentiation of the asteroid Ceres as revealed by its shape, Nature 437, 224, 2005. doi: 10.1038/nature03938