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3. Seaborg, G. T., Katz, J. J., and Manning, W. M. (eds) (1949) The Transuranium Elements, Natl Nucl. En. Ser., Div. IV, 14B, McGraw-Hill, New York, papers 1.1a, Lib, and 1.4, pp. 1, 3, and 13.
4. Kennedy, J. W., Seaborg, G. T., Segré, E., and Wahl, A. C. (1946) Phys. Rev., 70, 555–6 (submitted May 29, 1941);
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