Riyantika, Regina, and Dadang Gunawan. “Feasibility Analysis Of Gsm-R System For Railways In Indonesia: Case Study Of Jakarta Bandung High Speed Train”. Journal Research of Social Science, Economics, and Management 3, no. 5 (May 25, 2023): 1310 – 1319. Accessed December 5, 2025. https://jrssem.publikasiindonesia.id/index.php/jrssem/article/view/613.