TY  - JOUR
A1  - Hansen, K.T.
A1  - Heckman, J.J. 
A1  - Mullen, K.
T1  - The effect of schooling and ability on achievement test scores
Y1  - 2004
DO  - 10.1016/j.jeconom.2003.10.011
JF  - Journal of Econometrics
VL  - 121
IS  - 1–2

ER  -