Gonçalves, P. de S. et al. 2014. Repeatability coefficient and efficiency of micro tapping, test in seedlings of rubber tree. Pesquisa Agropecuaria Brasileira. 17, 2 (Apr. 2014), 233–237. DOI:https://doi.org/10.1590/S1678-3921.pab1982.v17.15618.