4 IZA Discussion Papers
IZA Discussion Paper No. 9020
published in: Economics Letters, 2015, 133, 10-13
IZA Discussion Paper No. 6352
substantially revised version pubslished as 'City age and city size' in: European Economic Review, 2014, 71,193-208
IZA Discussion Paper No. 3928
published in: Journal of Economic Geography, 2011, 11 (4), 667-686
IZA Discussion Paper No. 3180
published in: Journal of Urban Economics, 2008, 64 (2), 326-339