TY  - JOUR
A1  - Altonji, J.G.
A1  - Elder, T.E.
A1  - Taber, C.R.
T1  - Selection on observed and unobserved variables: Assessing the effectiveness of Catholic schools
Y1  - 2005
DO  - 10.1086/426036
VL  - 113
IS  - 1

ER  -