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References
Mayr, G., Ric. Sci., 28, 1015 (1958); 29, 542 (1959).
Mayr, G., Migration of Radium in Contact with Lead (in preparation); Ric. Sci., November 1960 (concerning the preparation of sources).
Jensen, M. L., Amer. J. Sci., 250, 808 (1952).
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MAYR, G. Activated Natural Crystals. Nature 190, 229–231 (1961). https://doi.org/10.1038/190229a0
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DOI: https://doi.org/10.1038/190229a0