@misc{W2147269409,
  author = {J. Durbin and Siem Jan Koopman},
  title = {Time Series Analysis by State Space Methods},
  year = {2012},
  howpublished = {Oxford University Press eBooks},
  doi = {https://doi.org/10.1093/acprof:oso/9780199641178.001.0001}
}