@article {210163,
	title = {Effect of silica content on the acid resistance of enamels},
	journal = {Advances in Natural and Applied Sciences},
	volume = {7},
	year = {2013},
	pages = {300-307},
	author = {Sh. K. Amin and M. M. Ahmed and E.S.K. El Sayed and M. F. Abadir}
}
