S. S. Fichtner, A. N. de Paula, E. C. Jardim, E. C. da Silva, and H. O. da silva Lopes, “MINERAL COMPOSITION OF SOILS, FORAGE AND ANIMAL TISSUE IN THE RIO VERDE REGION, GOIÁS, BRAZIL: COOPER, MOLYBDENIUM AND SELENIUM”, Pesq. Agropec. Trop., vol. 20, no. 1, pp. 1–6, Dec. 2007.