@book{1500364,
	author = {Badi H. Baltagi},
	title = {Panel Data Econometrics Theoretical Contributions and Empirical Applications},
	publisher = {Emerald Publishing},
	year = {2006},
	url = {https://www.emerald.com/insight/publication/doi/10.1016/S0573-8555(2006)274}
}