Lee, David .S. <br/><br/>
Training, Wages, and Sample Selection: Estimating Sharp Bounds on Treatment Effects 
 2009 

 -  2009 
 - 1071-1102  V.  76(3)  Issue.   268 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics
<br/><br/><label>Subjects--Index Terms: </label>Training;Wages;