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Waber, Niklaus; Schorscher, H.D.; Peters, T.J. (1992). Hydrothermal and supergene uranium mineralization at the Osamu Utsumi mine, Poços de Caldas, Minas Gerais, Brazil. Journal of Geochemical Exploration, 45(1-3), pp. 53-112. Elsevier 10.1016/0375-6742(92)90122-O
