URL dokumen:
https://prisma.simaster.ugm.ac.id/karya_files/comparison-of-the-vs30-model-and-site-class-based-on-masw--microtremor-and-n-spt-data-in-the-opak-river-basin-dcfcd07e645d245babe887e5e2daa016/36765192-51cd-11ef-a04f-00505691351c