TY  - JOUR
A1  - Horowitz, J.L.
T1  - Semiparametric Estimation of a Proportional Hazard Model with Unobserved Heterogeneity
Y1  - 1999
DO  - 10.1111/1468-0262.00068
JF  - Econometrica
VL  - 67
IS  - 5
SP  - 1001
EP  - -1028

ER  -