L. R. G. Guilherme, L. R. Oliveira, N. Curi, and M. L. N. Silva, “Effect of ionic strength of the equilibrium solution upon lead adsorption/desorption in Brazilian Oxisols”, PAB, vol. 36, no. 8, pp. 1077–1084, Aug. 2001, doi: 10.1590/S1678-3921.pab2001.v36.6232.