S. M. Utomo, B. A. Nugroho, T. W. Sasongko, and A. Krisnowo, “Competitiveness Analysis Railway Propulsion System Industry in Indonesia - Pre Feasibility Study”, ijaers, vol. 7, no. 5, May 2020, Accessed: Dec. 04, 2024. [Online]. Available: https://journal-repository.com/index.php/ijaers/article/view/2002