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Hîrtopanu Paulina; Andersen J. C.; Fairhurst R. J.; Ludusan N.; Jakab Gy.: Nb, Ta, Ti, ree (y) Zr, Sn, Th, U oxides from gradistea de munte rare element minerals occurrence, Sebes Mts., Romania. In: Acta mineralogica-petrographica, (7). p. 54. (2012)