URL dokumen:
https://prisma.simaster.ugm.ac.id/karya_files/effect-of-5--sildenafil-citrate-gel-application-on-collagen-density-and-epithelial-thickness-in-secondary-healing-of-the-palate-excision-wou-dcfcd07e645d245babe887e5e2daa016/ea919136-c68b-11f0-ae8a-e4434b0aa6de
