Least-squares moment matching reduction methods
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It is shown how the two apparently different approaches to modelling reduction by least-squares time moment matching give identical results. This property also enables a clear understanding of how the method actually approximates the system. Computational savings are seen to be made by adopting the two-stage approach.
Smith, I.D. and Lucas, T.N. 1995. Least-squares moment matching reduction methods. Electronics Letters. 31(11): p.929-930. Available from http://dx.doi.org/10.1049/el:19950585