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2. Competition and innovation: An inverted-U relationship;Philippe Aghion;The quarterly journal of economics,2005
3. Innovation and institutional ownership;Philippe Aghion;American economic review,2013
4. The Porter hypothesis at 20: can environmental regulation enhance innovation and competitiveness?;Stefan Ambec;Review of environmental economics and policy,2013
5. Another look at the instrumental variable estimation of error-components models;Manuel Arellano;Journal of econometrics,1995