Castro, Antonio Maria G. de, et al. “ Macronutrients Extrated and Exported by Guaraná Fruits (Paullinia Cupana Var. Sorbilis) in Amazonas State, Brazil ”. Anais Da Escola Superior De Agricultura Luiz De Queiroz, vol. 32, Jan. 1975, pp. 609-14, https://doi.org/10.1590/S0071-12761975000100053.