TY  - JOUR
TI  - Training, Wages, and Sample Selection: Estimating Sharp Bounds on Treatment Effects
AU  - David S. Lee
JO  - The Review of Economic Studies
PY  - 2009
VL  - 76
IS  - 3
DO  - 10.1111/j.1467-937x.2009.00536.x
UR  - https://doi.org/10.1111/j.1467-937x.2009.00536.x
ER  -