Pimentel-Gomes, F., Rossetti, A. G., & Viégas, R. M. F. (2013). The optimum piat size in experinients with rubber trees. Pesquisa Agropecuaria Brasileira, 24(8), 1021–1026. https://doi.org/10.1590/S1678-3921.pab1989.v24.16186