Aroh, Kenechukwu U., and Justina U. Udensi. “Study on Interactive Effects of Different Levels of Lead and Mercury on Nitrogen Fixation of Some Diazotrophs”. Journal of Advances in Biology & Biotechnology 24, no. 2 (April 28, 2021): 34-42. Accessed December 8, 2021. https://www.journaljabb.com/index.php/JABB/article/view/30200.