Gonçalves, Paulo de Souza, et al. “Relationship Between Ortets-Ramets and Its Efficiency in Microtest Tapping for Early Rubber Plant Selection”. Pesquisa Agropecuaria Brasileira, vol. 19, no. 8, Apr. 2014, pp. 1003-10, doi:10.1590/S1678-3921.pab1984.v19.16009.