Ula, D. A., and A. Ashat. “A Study on Renewable Energy Certificates As Enabling Instruments for Geothermal Energy Advancement”. ITB Graduate School Conference, vol. 5, no. 1, Oct. 2025, pp. 543-57, https://gcs.itb.ac.id/proceeding-igsc/index.php/igsc/article/view/693.