Boock, Marcello Villar, et al. “Heritability, Genetic Variability and Genetic Gain for Yield and Morphologic Characters in Young Progenies of Rubber Trees”. Pesquisa Agropecuaria Brasileira, vol. 30, no. 5, May 1995, pp. 673-81, doi:10.1590/S1678-3921.pab1995.v30.4352.