@article {13,
	title = {Invariance principles for impulsive switched systems},
	journal = {Dynamics of Continuous, Discrete and Impulsive Systems Series B: Applications \& Algorithms},
	volume = {16},
	year = {2009},
	pages = {631{\textendash}654},
	author = {Jun Liu and Xinzhi Liu and Wei-Chau Xie}
}
