do Carmo, Ciríaca Arcangela Ferreira de Santana, et al. “Nutritional Evaluation of Rubber Tree Plantations at Zona Da Mata Region, Minas Gerais State, Brazil”. Pesquisa Agropecuaria Brasileira, vol. 37, no. 10, Oct. 2002, pp. 1437-44, doi:10.1590/S1678-3921.pab2002.v37.6488.