dos Santos, Djalma Cordeiro, et al. “Genetic Parameter Estimates on Forage Cactus Clones Opuntia Ficus-Indica Mill and Nopalea Cochenillifera Salm-Dick”. Pesquisa Agropecuaria Brasileira, vol. 29, no. 12, Dec. 1994, pp. 1947-5, https://doi.org/10.1590/S1678-3921.pab1994.v29.4253.