ISS property for time-varying systems and application to partial-static feedback stabilization and asymptotic tracking

@article{Tsinias1999ISSPF,
  title={ISS property for time-varying systems and application to partial-static feedback stabilization and asymptotic tracking},
  author={John Tsinias and Iasson Karafyllis},
  journal={IEEE Trans. Automat. Contr.},
  year={1999},
  volume={44},
  pages={2179-2184}
}
A concept of input-to-state stability for time-varying control systems is introduced that constitutes extension of the well-known notion concerning the autonomous case. We use this concept to derive sufficient conditions for global stabilization of triangular systems by means of a time-varying smooth feedback and to achieve asymptotic tracking of unbounded signals. 
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