Parametrization and optimization of reduced-order filters

@article{Xie1999ParametrizationAO,
  title={Parametrization and optimization of reduced-order filters},
  author={Lihua Xie and Wei-Yong Yan and Yeng Chai Soh},
  journal={IEEE Trans. Automat. Contr.},
  year={1999},
  volume={44},
  pages={418-422}
}