Dagoumas, Athanasios S., and Nikolaos E. Koltsaklis. “Price Signal of Tradable Guarantees of Origin for Hedging Risk of Renewable Energy Sources Investments”. International Journal of Energy Economics and Policy 7, no. 4 (September 30, 2017): 59–67. Accessed May 5, 2024. https://www.econjournals.com/index.php/ijeep/article/view/5231.