A. Horowttz and H. da S. Dantas, “The geochemistry of minor elements in Pernambuco soils. IV. Zinc in the ‘Zona Litoral-Mata’”, PAB, vol. 11, no. 12, pp. 27–35, Apr. 2014, doi: 10.1590/S1678-3921.pab1976.v11.16916.