Danna, Abba, Bakari Abbo, and Youssouf Pare. “The Effects of Water Level Shrinkage in the Lake Chad Basin on Costs of Production of Local Residents”. International Journal of Applied Mathematical Research 7, no. 1 (December 17, 2017): 7–9. Accessed December 21, 2024. https://sciencepubco.com/index.php/ijamr/article/view/7315.