4 IZA Discussion Papers
IZA Discussion Paper No. 14323
IZA Discussion Paper No. 5478
published in: Journal of Econometrics, 2014, 178, Part 2, 273-285
IZA Discussion Paper No. 4299
published in: Bulletin of Economic Research, 2012, 64 (3), 344–366
IZA Discussion Paper No. 3712
published in: Philip Arestis and Malcolm Sawyer (eds.), International Papers in Political Economy, Palgrave-Macmillan, 2009