MICHAEL UDOIDIONG, O. .; JULIUS ORIBHABOR, B. .; EFFIONG MUNAM, E. .; JAMES BERNARD, J. . Assessment of the impact of human settlement on the heavy metal concentrations of lower cross river, Nigeria. Scientific Journal of Pure and Applied Sciences, [S. l.], v. 2, n. 7, p. 270-278, 2013. Disponível em: http://sjournals.com/index.php/sjpas/article/view/970. Acesso em: 22 jul. 2024.