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*{{cite journal |last1=Imbens |first1=Guido W. |first2=Jeffrey M. |last2=Wooldridge |year=2009 |title=Recent Developments in the Econometrics of Program Evaluation |journal=[[Journal of Economic Literature]] |volume=47 |issue=1 |pages=5–86 |doi=10.1257/jel.47.1.5 |url=http://nrs.harvard.edu/urn-3:HUL.InstRepos:3043416 }}
*{{cite journal |first1=Jon |last1=Bakija |first2=Bradley |last2=Heim |title=How Does Charitable Giving Respond to Incentives and Income? Dynamic Panel Estimates Accounting for Predictable Changes in Taxation |journal=NBER Working Paper No. 14237 |date=August 2008 |doi=10.3386/w14237 |doi-access=free }}
*{{cite journal |first1=T. |last1=Conley |first2=C. |authorlink1=Timothy G. Conley|last2=Taber |title=Inference with 'Difference in Differences' with a Small Number of Policy Changes |journal=NBER Technical Working Paper No. 312 |date=July 2005 |doi=10.3386/t0312 |doi-access=free }}
==External links==
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