@ARTICLE{9622753,
  author={Xie, Xiangpeng and Qiu, Xuan and Gu, Zhou},
  journal={IEEE Transactions on Circuits and Systems II: Express Briefs}, 
  title={Observer-Based Multi-Instant Fuzzy State Estimation of Discrete-Time Nonlinear Circuits via a New Slack Variables Technique}, 
  year={2022},
  volume={69},
  number={4},
  pages={2191-2195},
  doi={10.1109/TCSII.2021.3129463}}

Xiangpeng Xie; Xuan Qiu; Zhou Gu, Observer-based multi-instant fuzzy state estimation of discrete-time nonlinear circuits via a new slack variables technique, in IEEE Transactions On Circuits and Systems II: Express Briefs, vol. 69, no. 4, pp. 2191-2195, April 2022.