URL dokumen:
https://prisma.simaster.ugm.ac.id/karya_files/volume-estimation-of-the-thickest-scoriaceous-tephra-fall-deposits-on-the-south-southeastern-flank-of-mt--raung-dcfcd07e645d245babe887e5e2daa016/652ce97e-27bf-11ef-ae9c-e4434b0aa6de