Naimah K, Sasongko NA, Widayatno RL. Financial Analysis of Green Petroleum Coke as A Coal Blend in Steel Industry to Support National Energy Security. JDE [Internet]. 2021 Nov. 25 [cited 2024 Dec. 27];6(2):275-8. Available from: https://e-journal.unair.ac.id/JDE/article/view/24825