2 IZA Discussion Papers
IZA Discussion Paper No. 2971
published in: Patrick Sevestre and Lazlo Matyas (eds.), The Econometrics of Panel Data: Handbook of Theory and Applications, 3rd edition, Springer, 2008, 547-601
IZA Discussion Paper No. 1850
published in: Patrick Sevestre and Lazlo Matyas (eds.), The Econometrics of Panel Data: Handbook of Theory and Applications, 3rd ed., Springer, 2008, 865-905