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Gmelin Handbook: U: SVol.C8, 5.1.1, page 3 - 12
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Caillat, R.
in:P. Pascal, Nouveau Traite de Chimie Minerale, Bd. XV, Fasz. 2, Masson et Cie., Paris 1961, S.13/8
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Katz, J. J.; Rabinowitch, E.
The Chemistry of Uranium, Tl. I, McGrow-Hill, New York-Toronto-London 1951, S.349/55