URL dokumen:
https://prisma.simaster.ugm.ac.id/karya_files/analyzing-recent-seismic-activity-of-the-opak-fault-system-in-central-java--indonesia--from-2009-to-2021-dcfcd07e645d245babe887e5e2daa016/a2b8e920-b056-11ee-abf0-e4434b0aade8