TY  - JOUR
TI  - Testing Identifiability and Specification in Instrumental Variable Models
AU  - John G. Cragg
AU  - Stephen G. Donald
JO  - Econometric Theory
PY  - 1993
VL  - 9
IS  - 2
DO  - 10.1017/s0266466600007519
UR  - https://doi.org/10.1017/s0266466600007519
ER  -