Umoh, E. S. (2015) “Some Applications of Partial Derivatives on Renewable Energy for Sustainable Development”, Journal of Chemical, Mechanical and Engineering Practices (JCMEP), 5(1-3), pp. 28–32. Available at: http://icidr.org.ng/index.php/Jcmep/article/view/1103 (Accessed: 9 November 2024).