Fichtner, S.S. et al. (2007) “MINERAL COMPOSITION OF SOILS, FORRAGE AND ANIMAL TISSUE IN THE RIO VERDE REGION, GOIÁS, BRAZIL: CALCIUM, PHOSPHORUS AND MAGNESIUM”, Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], 20(1), pp. 7–13. doi:10.5216/pat.v20i1.2583.