Santana H. Semina: Ciências Exatas e Tecnológicas, v. 9, n.4, 1988. Semin., Exact Tech. Scienc. [Internet]. 2004 Dec. 15 [cited 2024 May 8];9(4). Available from: https://ojs.uel.br/revistas/uel/index.php/semexatas/article/view/2682