Ofonyelu, C Chris, and Eguabor R. E. “Metered and Unmetered Billing: How Asymmetric Are the Phcn Bills?”. Journal of Social Economics Research 1, no. 5 (May 15, 2014): 97–107. Accessed March 28, 2024. https://archive.conscientiabeam.com/index.php/35/article/view/1298.