J. R. da R. Campos, A. C. Silva, E. de B. Silva, and P. Vidal-Torrado, “Extraction and quantification of exchangeable aluminum in Fibric Histosol”, PAB, vol. 49, no. 3, pp. 207–214, May 2014, doi: 10.1590/S1678-3921.pab2014.v49.18498.