A tabular approach to the stability equation method
A tabular method for reducing polynomial degrees by the stability equation criterion is given. It is the consequence of an interesting multipoint Taylor polynomial approximation property which is shown to hold for the method. The resulting iterative Routh- type algorithm is easily applied to the system transfer function numerator and denominator polynomials and does away with the need to employ time-constant form and root-finding methods. Numerical examples are given to illustrate the new approach.
Lucas, T.N. 1992. A tabular approach to the stability equation method. Journal of the Franklin Institute. 329(1): pp.171-180. Available from http://dx.doi.org/10.1016/0016-0032(92)90106-Q