Gonçalves, P. de S., Rossetti, A.G. and Paiva, J.R. de (2014) “Repeatability coefficient and efficiency of micro tapping, test in seedlings of rubber tree”, Pesquisa Agropecuaria Brasileira, 17(2), pp. 233–237. doi:10.1590/S1678-3921.pab1982.v17.15618.