William A. Fowler, Harold C. Urey, Donald D. Clayton, George Wetherill and Earl Ingerson at UNESCO Plaza in Paris, August 1967, for the International Symposium Origin and Distribution of the Elements (Pergamon Press 1968). Claytons original decomposition of Pb isotopes appears in the proceedings under the title "Nucleosynthesis of the Isotopes of Lead" pp. 63-76.
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