Gadélha, Ricardo Sérgio de Sarmento, et al. “Effect of Organic Manuring to Pineapple Cv. Pérola in a Regosol”. Pesquisa Agropecuaria Brasileira, vol. 17, no. 4, Apr. 2014, pp. 545-7, doi:10.1590/S1678-3921.pab1982.v17.15745.