Model reduction by condensed continued-fraction method
It is shown how the continued-fraction method of Chen and Shieh may be used on part of the transfer function to produce reduced-order models when its normal application is unsatisfactory. In addition, the truncation method is shown to be related to this technique.
Lucas, T.N. 1985. Model reduction by condensed continued-fraction method. Electronics Letters. 21(16): p.680-681. Available from http://dx.doi.org/10.1049/el:19850481