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2. Thorium, uranium correlations and possible model for Th and U transport;Ballad;New York University, New York, N.Y., Intern. Rep.,1981
3. Geochronological and petrographic studies of alkaline rocks from southern Brazil;Bushee,1971
4. Relatório de síntese dos trabalhos de prospecção de urânio no planalto de Poços de Caldas;CNEN (Comissão Nacional de Energia Nuclear);Com. Nac. Energia Nucl., Rio de Janeiro, Intern. Rep.,1974
5. On nepheline rocks in Brazil with especial reference to the association of phonolite and foyaite;Derby;Geol. Soc. Q. J., London,1887