23 IZA Discussion Papers
IZA Discussion Paper No. 8543
published in: Journal of the European Economic Association, 2019, 17 (5), 1502 - 1037
IZA Discussion Paper No. 4852
IZA Discussion Paper No. 2170
published in: T. Sandler and K. Hardley (eds.), Handbook of Defense Economics Vol. 2, Elsevier 2007
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