TY  - BOOK
AU  - Ashenfelter Orley
TI  - Statistics and econometrics:  methods and applicati   
SN  - 0471107875
U1  - X:(B28), P3 
PY  - 2003///
CY  - New York
PB  - John Wiley        
KW  - Economics irt Statitics
ER  -