TY  - CHAP
A1  - Heckman, J.
A1  - Singer, B.
T1  - Social science duration analysis
Y1  - 1985
DO  - 10.1017/CCOL0521304539
A3  - Heckman, J.
A3  - Singer, B.
T2  - Longitudinal analysis of labor market data
CY  - Cambridge
PB  - Cambridge University Press

ER  -