Semina S. Semina: Ciências Exatas e Tecnológicas, V. 38, n. 1, 2017. Semin., Exact Tech. Scienc. [Internet]. 2017 Oct. 4 [cited 2024 May 3];38(1). Available from: https://ojs.uel.br/revistas/uel/index.php/semexatas/article/view/31089