URL dokumen:
https://prisma.simaster.ugm.ac.id/karya_files/comprehensive-analysis-and-economic-study-of-railway-brake-failure-from-metal-based-and-composites-based-materials-dcfcd07e645d245babe887e5e2daa016/00ea73d2-7eed-11ee-abf0-e4434b0aade8