National Bureau of Economic Research
A Simple, Positive Semi-Definite, Heteroskedasticity and Autocorrelation Consistent Covariance Matrix
1987 · Whitney K. Newey, Kenneth D. West · Econometrica
Endogenous Technological Change
1989 · Paul Romer
How Much Should We Trust Differences-In-Differences Estimates?
2004 · Bertrand Moine, Esther Duflo, et al. · The Quarterly Journal of Economics