Súarez, Y. R., A. P. Lemke, and C. A. L. Cardoso. “Interspecific Differentiation in Heavy Metals Concentration in Fishes of the Apa River, Upper Paraguay River Basin”. Orbital: The Electronic Journal of Chemistry, Vol. 10, no. 1, Jan. 2018, pp. 78-82, https://periodicos.ufms.br/index.php/orbital/article/view/16392.