Onolemhemhen, R. , Bello, S. , Iwayemi, A. (2017), 'Evaluating the Nexus between Energy Demand and Economic Growth Using the VECM Approach: Case Study of Nigeria, China, and the United States', World Academy of Science, Engineering and Technology, Open Science Index 126, International Journal of Economics and Management Engineering, 11(6), 1633 - 1638.