I. P. de Oliveira, J. Kluthcouski, and R. S. M. dos Santos, “SOIL AND MICRONUTRIENT ACIDITY AVAILABILITY AS AFFECTED BY SOIL MANAGEMENT”, Pesq. Agropec. Trop., vol. 29, no. 2, pp. 19–25, Dec. 2007, doi: 10.5216/pat.v29i2.2836.