Nnaji, C. E., J. O. Chukwu, and M. Nnaji. “Does Domestic Energy Consumption Contribute to Exports? Empirical Evidence From Nigeria”. International Journal of Energy Economics and Policy, vol. 3, no. 3, June 2013, pp. 297-06, https://www.econjournals.com/index.php/ijeep/article/view/466.