BINNING, K.; BAIRD, D. Survey of heavy metals in the sediments of the Swartkops River Estuary, Port Elizabeth South Africa. Water SA, [S. l.], v. 27, n. 4, p. 461–466, 2001. DOI: 10.4314/wsa.v27i4.4958. Disponível em: https://www.ajol.info/index.php/wsa/article/view/4958. Acesso em: 15 aug. 2026.