Dehejia, Rajeev H <br/><br/>
Propensity score matching methods for non-experimental casual studies 

 - Cambridge, MA  NBER  1998 
 - 22p 
 - NBER Working Paper Series .
<br/><br/><label>ISBN: </label>
<br/><br/><label>Dewey Class. No.: </label>WP 6829