@book{70740,
	author = {Chen, Mian-Yun. and ebrary, Inc.},
	title = {Grey systems},
	publisher = {Emerald Group Publishing,},
	year = {2004.},
	series = {Kybernetes. no. 2 ;},
	address = {Bradford, West Yorkshire, England :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10058603}
}