@article {koumboulis2007robust,
	title = {Robust disturbance rejection for left invertible singular systems with nonlinear uncertain structure},
	journal = {wsq},
	volume = {1},
	number = {1},
	year = {2007},
	pages = {1},
	author = {Fotis N. Koumboulis and Skarpetis, Michael G and Tzamtzi, Maria P}
}
