GEBREYESUS, S. T. Heavy Metals in Contaminated Soil: Sources & Washing through Chemical Extractants. American Academic Scientific Research Journal for Engineering, Technology, and Sciences, [S. l.], v. 10, n. 1, p. 54–60, 2015. Disponível em: https://www.asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/730. Acesso em: 4 dec. 2022.