Fichtner, S.S. et al. (2007) “MINERAL COMPOSITION OF SOILS, FORAGE AND ANIMAL TISSUE IN THE RIO VERDE REGION, GOIÁS, BRAZIL: COOPER, MOLYBDENIUM AND SELENIUM”, Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], 20(1), pp. 1–6. doi:10.5216/pat.v20i1.2582.