1. A. D. Anbar, G. J. Wasserburg, D. A. Papanastassiou, The Lunatic Asylum of the Charles Arms Laboratory, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.
2. P. S. Andersson, Laboratory for Isotope Geology, Swedish Museum of Natural History, S-104 05 Stockholm, Sweden.