Rafindadi, Abdulkadir Abdulrashid. “Econometric Prediction on the Effects of Financial Development and Trade Openness on the German Energy Consumption: A Startling Revelation from the Data Set”. International Journal of Energy Economics and Policy, vol. 5, no. 1, Dec. 2014, pp. 182-96, https://econjournals.com/index.php/ijeep/article/view/941.