@book{35978,
	author = {Baltagi, Badi H. and ebrary, Inc.},
	title = {A companion to theoretical econometrics},
	publisher = {Blackwell,},
	year = {2001.},
	series = {Blackwell companions to contemporary economics},
	address = {Malden, Mass. :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10240331}
}