References

@article{McKelvey:AC:1996,
  author = "Tomas McKelvey and Huseyin Akcay and Lennart Ljung",
  title = "Subspace-Based Multivariable System Identification from Frequency Response Data",
  journal = ieeetac,
  volume = "41",
  number = "7",
  pages = "960--979",
  year = "1996"
}