J. das G. Santana, W. M. Leandro, R. V. Naves, and P. P. da Cunha, “DRIS NORMS INTERPRETATION FOR PLANT TISSUE AND SOIL FOR ‘PÊRA’ ORANGE IN THE GOIÁS STATE CENTRAL REGION”, Pesq. Agropec. Trop., vol. 38, no. 2, pp. 109–117, Jun. 2008.