AIGBERUA, A. O., EKUBO, A. T., INENGITE, A. K., & IZAH, S. C. (2017). Assessment of some selected heavy metals and their pollution indices in an oil spill contaminated soil in the Niger Delta: a case of Rumuolukwu community. Biotechnological Research, 3(1), 11-19. Retrieved from http://br.biomedpress.org/index.php/br/article/view/740