Horowitz, Arão. “The Geochemistry of Molybdenum in the Coastal Area Soils of the State of Pernambuco, Brazil”. Pesquisa Agropecuaria Brasileira, vol. 13, no. 1, Apr. 2014, pp. 73-91, doi:10.1590/S1678-3921.pab1978.v13.16752.