Ysambertt, F., J. Paredes, y N. Márquez. «Analysis of Copper and Zinc Content in the Drinking Water of Maracaibo City. A Technical Note». Rev. Téc. Fac. Ing. Univ. Zulia, Vol. 19, n.º 1, 1, https://produccioncientificaluz.org/index.php/tecnica/article/view/5498.