3 IZA Discussion Papers
IZA Discussion Paper No. 15210
IZA Discussion Paper No. 5856
revised version published in: Olivier de la Grandville (ed.), Economic Growth and Development, Frontiers of Economics and Globalization, Vol. 11, Bingley, 2011, 25 - 41
IZA Discussion Paper No. 4817
revised version published in: Journal of Peace Research, 2012, 49 (6), 769-783