Oke, Sunday, and Oluwafemi Oyedokun. “Development and Application of a Mathematical Model for Evaluating Extra Energy Cost Due to Disproportional Energy Consumption”. Journal of Business Economics and Management 8, no. 2 (June 30, 2007): 155-161. Accessed October 20, 2019. https://journals.vgtu.lt/index.php/JBEM/article/view/7585.