Gomes, Gil Mario Ferreira, et al. “Chemical Composition of Cactus Pear Cladodes under Different Fertilization and Harvesting Managements”. Pesquisa Agropecuaria Brasileira, vol. 53, no. 2, Mar. 2018, pp. 221-8, doi:10.1590/S1678-3921.pab2018.v53.25310.