146 IZA Discussion Papers
IZA Discussion Paper No. 690
IZA Discussion Paper No. 681
published in: Journal of Economic Dynamics and Control, 2010, 34 (3), 490-502
IZA Discussion Paper No. 617
IZA Discussion Paper No. 609
IZA Discussion Paper No. 342
published in: Economics Letters, 2002, 75 (2), 171-178