@article{ljung1978,
  title={On a measure of lack of fit in time series models},
  author={Greta M. Ljung and George E. P. Box},
  year={1978},
  journal={Biometrika},
  doi={10.1093/biomet/65.2.297},
  url={https://doi.org/10.1093/biomet/65.2.297}
}