1. Mostly Harmless Econometrics
2. Racial and ethnic disparities in the use of health services
3. Advice on using heteroskedasticity-based identification
4. Baum C.F. Schaffer M.E. &Stillman S.(2010).ivreg2: Stata module for extended instrumental variables/2SLS GMM and AC/HAC LIML and k‐class regression.Statistical Software Components S425401 Boston College Department of Economics.
5. Baum C.F. &Schaffer M.E.(2012).ivreg2h: Stata module to perform instrumental variables estimation using heteroskedasticity‐based instruments.Statistical Software ComponentsS457555 Boston College Department of Economics.