Santana, João das Graças, et al. “DRIS NORMS INTERPRETATION FOR PLANT TISSUE AND SOIL FOR ‘PÊRA’ ORANGE IN THE GOIÁS STATE CENTRAL REGION”. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], vol. 38, no. 2, June 2008, pp. 109-17, https://revistas.ufg.br/pat/article/view/4160.