3 IZA Discussion Papers
IZA Discussion Paper No. 2339
published in: Journal of Monetary Economics, 2007, 54 (s1), 37-55
IZA Discussion Paper No. 1991
published in: Larry Blume and Steven Durlauf (eds), The New Palgrave Dictionary of Economics, 2nd ed (London: Palgrave), 2007
IZA Discussion Paper No. 1975