Analysis of fast-sampled non-linear systems: Generalised frequency response functions for delta-operator models. - M. A. Chadwick; Visakan Kadirkamanathan; S. A. Billings (Signal Process., 2006)

An iterative Kalman smoother/least-squares algorithm for the identification of delta-ARX models. - M. A. Chadwick; Sean R. Anderson; Visakan Kadirkamanathan (Int. J. Syst. Sci., 2010)