Gonçalves, Paulo de Souza, et al. “Performance of Amazonian Rubber Tree Clones in the Plateau Region of the State of São Paulo, Brazil”. Pesquisa Agropecuaria Brasileira, vol. 36, no. 12, Dec. 2001, pp. 1469-77, doi:10.1590/S1678-3921.pab2001.v36.6281.