Serim, Nilgün, and Filiz Coban Oran. “The Renewable Energy Policy Convergence in the EU: A Comparison on Germany and Turkey’s Incentives for the Wind and Solar Energy Resources”. International Journal of Energy Economics and Policy, vol. 7, no. 3, July 2017, pp. 308-20, https://mail.econjournals.com/index.php/ijeep/article/view/4906.