Naimah, Khoirun, Nugroho Adi Sasongko, and Rudy Laksmono Widayatno. “Financial Analysis of Green Petroleum Coke As A Coal Blend in Steel Industry to Support National Energy Security”. Journal of Developing Economies 6, no. 2 (November 25, 2021): 275–285. Accessed December 27, 2024. https://e-journal.unair.ac.id/JDE/article/view/24825.