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- [5] What did I leave out? Omitted variables in regression and qualitative comparative analysis European Political Science, 2019, 18 : 275 - 290
- [9] Small sample properties of a ridge regression estimator when there exist omitted variables Statistical Papers, 2011, 52 : 953 - 969
- [10] Erratum to: Small sample properties of a ridge regression estimator when there exist omitted variables Statistical Papers, 2012, 53 : 249 - 249