Michael Udoidiong, O. ., Julius Oribhabor, B. ., Effiong Munam, E. ., & James Bernard, J. . (2013). Assessment of the impact of human settlement on the heavy metal concentrations of lower cross river, Nigeria. Pure and Applied Science Advances, 2(7), 270-278. Retrieved from http://www.sjournals.com/index.php/sjpas/article/view/970