MUMMA M.J. et al. (1993) Comets and the origin of the solar system - Reading the Rosetta Stone (In Protostars and Planets III, eds. E.H. Levy, J.I. Lunine, pp. 1177-1252, Univ. Arizona Press, Tucson, Arizona, USA). D.W.G. SEARS (1996) Is Kaidun really the Rosetta stone? (Meteoritics 31-5, 1996, 543). Best wishes, Bernd