TY  - JOUR
A1  - Heckman, J.
A1  - Singer, B.
T1  - The Identifiability of the Proportional Hazard Model
Y1  - 1984
DO  - 10.2307/2297689
JF  - The Review of Economic Studies
VL  - 51
IS  - 2
SP  - 231
EP  - -241

ER  -