Bueno, N., H.P. Haag, J.P. Pereira, and I.J.M. Viégas. 1989. “ Mineral Nutrition of Rubber Plants: XI. Aluminum Concentration in the Substract Affecting the Composition of N, P, K in Young Rubber Trees (Hevea sp.) ”. Anais Da Escola Superior De Agricultura Luiz De Queiroz 46 (1): 135-54. https://doi.org/10.1590/S0071-12761989000100010.