@article{ai2003,
  title={Interaction terms in logit and probit models},
  author={Chunrong Ai and Edward C. Norton},
  year={2003},
  journal={Economics Letters},
  doi={10.1016/s0165-1765(03)00032-6},
  url={https://doi.org/10.1016/s0165-1765(03)00032-6}
}