Heavy metals in the sludge of the upper Bogotá River basin, between Villapinzón and Chocontá. REVISTA AMBIENTAL AGUA, AIRE Y SUELO, [S. l.], v. 10, n. 2, p. 1–8, 2019. DOI: 10.24054/aaas.v10i2.387. Disponível em: https://ojs.unipamplona.edu.co/index.php/aaas/article/view/387. Acesso em: 16 oct. 2025.