Gonçalves, P. de S. et al. 2000. Effect of tapping frequency and stimulation on yield and economic performance of rubber tree clones. Pesquisa Agropecuaria Brasileira. 35, 6 (Jun. 2000), 1081–1091. DOI:https://doi.org/10.1590/S1678-3921.pab2000.v35.5877.