“Heavy metals concentration (cr total, pb, cd) in surface water and sediments in the salado (guayaquil)”. Revista Universidad de Guayaquil, [S. l.], v. 113, n. 2, p. 29–34, 2012. DOI: 10.53591/rug.v113i2.1186. Disponível em: https://revistas.ug.edu.ec/index.php/rug/article/view/471. Acesso em: 5 dec. 2025.