@article {20,
	title = {Generalized invariance principles for switched delay systems},
	journal = {IMA Journal of Mathematical Control and Information},
	volume = {28},
	year = {2011},
	pages = {19{\textendash}39},
	doi = {10.1016/j.aml.2010.10.001},
	author = {Jun Liu and Xinzhi Liu and Wei-Chau Xie}
}
