TY  - JOUR
A1  - Heckman, J.J.
A1  - Walker, J.R.
T1  - The relationship between wages and income and the timing and spacing of births: Evidence from Swedish longitudinal data
Y1  - 1990a
DO  - 10.2307/2938322
JF  - Econometrica
VL  - 58
IS  - 6
SP  - 1411
EP  - -1441

ER  -