TY  - JOUR
A1  - Bound, J.
A1  - Solon, G.
T1  - Double trouble: On the value of twins-based estimation of returns to schooling
Y1  - 1999
DO  - 10.1016/S0272-7757(98)00048-X
JF  - Economics of Education Review
VL  - 18
IS  - 2
SP  - 169
EP  - -182

ER  -