@article{econhot_econhot-cited-b87832822f410e3d,
  title = {Testing Identifiability and Specification in Instrumental Variable Models},
  author = {John G. Cragg and Stephen G. Donald},
  journal = {Econometric Theory},
  year = {1993},
  volume = {9},
  number = {2},
  pages = {222-240},
  doi = {10.1017/s0266466600007519},
  url = {https://doi.org/10.1017/s0266466600007519}
}