@book{20670,
	author = {Amr Elhagry Mahmoud and Ashraf Hussein Sherif , },
	title = {Bacterial leakage beneath cast nickel chromium full veneer crowns using different core materials and luting agents / },
	publisher = {Amr Elhagry Mahmoud , },
	year = {1995},
	address = {Cairo : },
	url = {http://172.23.153.220/th.pdf}
}