Filho, A. de C.V., Moreira, A. and Castro, P.R. de C. e (2001) “Effect of liming and fertilization on nutritional state and dry rubber production of rubber-tree”, Pesquisa Agropecuaria Brasileira, 36(8), pp. 1019–1026. doi:10.1590/S1678-3921.pab2001.v36.6225.