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Takayasu, O. (1991). The “third-element-added” isotope-separation process using thermal diffusion. International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes, 42(6), 535–540. doi:10.1016/0883-2889(91)90158-w 
10.1016/0883-2889(91)90158-w