Justina I. R. Udotong and Ime R. Udotong and Offiong U. Eka, Spatio-temporal Variations in Heavy Metal Concentrations in Sediment of Qua Iboe River Estuary, Nigeria. journal = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology. June 2015, vol. 102(6). 681 - 685 [viewed 19 September 2024]. Available from: https://publications.waset.org/pdf/10001538.