@thesis{thesis,
		author={Guntur Saputra },
		title ={PENGARUH LAMA PERENDAMAN LARUTAN KOPI TERHADAP PERUBAHAN WARNA IONOMER KACA ATRA UMATIC RESTORATIVE TREATMENT},
		year={2008},
		url={https://etd.umy.ac.id/id/eprint/7365/},
		abstract={}
		}