Awofolu, O. R., Okonkwo, J. O., Roux-Van Der Merwe, R., Badenhorst, J., & Jordaan, E. (2006). A new approach to chemical modification protocols of Aspergillus niger and sorption of lead ion by fungal species. Electronic Journal of Biotechnology, 9(4), 0–0. Retrieved from https://www.ejbiotechnology.info/index.php/ejbiotechnology/article/view/v9n4-1