Olatunji Ayotunde, Ezekiel, Benedict Obeten Offem, and Fidelis Bekeh Ada. “Heavy Metal Profile of Water, Sediment and Freshwater Cat Fish, Chrysichthys Nigrodigitatus (Siluriformes: Bagridae), of Cross River, Nigeria”. Revista de Biología Tropical 60, no. 3 (September 14, 2012). Accessed November 25, 2024. https://revistas.ucr.ac.cr/index.php/rbt/article/view/1807.