@book{13617,
	author = {Mona Mostafa Elbadawy and Hussein Abdelfattah Gomaa , },
	title = {The effect of bleaching on color change and surface texture of stained enamel and nano - filled resin composite / },
	publisher = {Mona Mostafa Elbadawy , },
	year = {2007},
	address = {Cairo : },
	url = {http://172.23.153.220/th.pdf}
}