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Leffingwell, T. P., Riess, R. W., & Melville, G. S. (1962). Liquid scintillator beta counting of iron-59 in clear and colored systems. The International Journal of Applied Radiation and Isotopes, 13(2), 75–86. doi:10.1016/0020-708x(62)90173-4 
10.1016/0020-708x(62)90173-4