@InCollection{Enqvist:2010a,
  author = 	 {Enqvist, Martin},
  title = 	 {Identification of Block-oriented Systems Using the
                  Invariance Property},
  booktitle = 	 {Block-oriented Nonlinear System Identification},
  pages =	 {147-158},
  publisher =	 {Springer},
  year =	 2010,
  editor =	 {Giri, F. and Bai, E.-W.},
  address =	 {Berlin Heidelberg}
}