@book{912,
	author = {Badi H Baltagi.},
	title = {Panel data econometrics},
	publisher = {Emerald,},
	year = {2006.},
	series = {Contributions to economic analysis,},
	address = {Bingley, U.K. :},
	url = {http://www.emeraldinsight.com/0573-8555/274}
}