@book{50943,
	author = {Hussain, Nandyala Sooraj,},
	title = {Physics and chemistry of rare-earth ions doped glasses /},
	publisher = {Trans Tech Publications,},
	year = {[2008]},
	series = {Materials science foundations,},
	address = {Stafa-Zurich ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10906065}
}