Gonçalves, Paulo de Souza, Mario Cardoso, and Luiz Alberto Sáes. 1991. “Performance of Four Rubber Tree Clones at the Ribeira River Valley, State of São Paulo, Brazil”. Pesquisa Agropecuaria Brasileira 26 (5):681-90. https://doi.org/10.1590/S1678-3921.pab1991.v26.3392.