TY  - BOOK
AU  - Oster, Emily
AU  - National Bureau Of Economic Research
TI  - Unobservable Selection and Coefficient Stability
PY  - 2013///
CY  - Cambridge
PB  - NBER
UR  - http://elibrary.igidr.ac.in/e-library/working papers/NBER/2013/E9922.pdf
ER  -