TY  - BOOK
AU  - Ashenfelter Orley
AU  -  Levine Phillip B
TI  - Statistics and econometrics: Methods and applications     
U1  - X:(B), P3 
PY  - 2003///
CY  - New York  
PB  -  John Wiley     
KW  - Econometrics Methods
ER  -