... Computing(Monticello,IL),1978,903-912.Lastman G. J., Sinha N.K,A comparison of the balanced matrix and the aggregation methodof model reduction,IEEE Trans. Auto. ControlAC-30(1985) 301-304.Lastman G. J., Sinha N.K,and Rozsa ... G. J. and Sinha N.K,An error analysis of the balanced matrix method, with appli-cation to the selection of reduced-order modes,Large Scale Systems9(1985) 63-71.Lastman G. J. and Sinha N.K,Worst-case ... which was developed later by Sinha et al. (1980). Another solution is to combine aggregation withthe matching of time-moments to ensure the stability, Hickin and Sinha [15]. Bistritz and Lanhols[5]...