1. Methods of quantitative validation for dynamic simulation models – Part I: Theory;Butterfield;Trans. Inst. Measurement and Control,1986
2. Methods of quantitative validation for dynamic simulation models – Part 2: Examples;Butterfield;Trans. Inst. Measurement and Control,1986
3. Model validation by the distortion method: linear state space systems;Cameron,1992
4. Model validation of discrete transfer functions using the distortion method;Cameron;Mathematical and Computer Modelling of Dynamical Systems,1998
5. An Introduction to the Mathematics of Servomechanisms;Douce,1963