Rofik, Ahmad, and Tantri Yanuar Rahmat Syah. “The Effect of Fuel Mix, Moderated by Indonesia Crude Price and Foreign Exchange, and Power Losses on Profitability of PT PlN (PERSERO)”. International Journal of Energy Economics and Policy, vol. 10, no. 4, May 2020, pp. 377-83, https://econjournals.org.tr/index.php/ijeep/article/view/9575.