Paiva, João Rodrigues de, et al. “In Vitro Pollen Germination of Some Rubber Tree Clones. Preliminary Results”. Pesquisa Agropecuaria Brasileira, vol. 18, no. 9, Apr. 2014, pp. 1021-9, https://doi.org/10.1590/S1678-3921.pab1983.v18.15415.