E. N. Borges, G. Laforga, R. M. Q. Lana, E. V. S. Borges, and L. M. da Costa, “Effect of lime and gypsum on calcium and aluminum amounts of the compacted layer of a Dark Red Latosol”, PAB, vol. 32, no. 12, pp. 1309–1315, Dec. 1997, doi: 10.1590/S1678-3921.pab1997.v32.4786.