@article{liu2012new,
  title={A new approach to H∞ filtering for linear time-delay systems},
  author={Liu, Jinliang and Gu, Zhou and Tian, Engang},
  journal={Journal of the Franklin Institute},
  volume={349},
  number={1},
  pages={184--200},
  year={2012},
  publisher={Elsevier}
}

Jingliang Liu, Zhou Gu , Engang Tian. A new approach to H∞ filtering for linear time-delay systems. Journal of the Franklin Institute, 2011,349(1), 184-200.