@article{87,
  author = {Jun Liu and Xinzhi Liu and Wei-Chau Xie},
  title = {Invariance principles for impulsive switched systems},
  year = {2009},
  journal = {Dynamics of Continuous, Discrete and Impulsive Systems Series B: Applications \& Algorithms},
  volume = {16},
  pages = {631\textendash654},
}