5 IZA Discussion Papers
IZA Discussion Paper No. 17088
IZA Discussion Paper No. 14349
IZA Discussion Paper No. 10821
published in: Econometrica, 2018, 86 (1), 1 - 35 [revised version available as NBER Working Paper No. 23497]
IZA Discussion Paper No. 6692
published as 'Testing for the Unconfoundedness Assumption Using an Instrumental Assumption' in: Journal of Causal Inference, 2014, 2, 187-199
IZA Discussion Paper No. 2738
published in: Journal of Econometrics, 2010, 155 (2), 99-116