@conference {koumboulis2007robust,
	title = {Robust Disturbance Rejection for Left Invertible Singular Systems with Nonlinear Uncertain Structure},
	booktitle = {WASET International Conference on Control, Automation and Systems (ICCAS 2007), Venice, Italy},
	year = {2007},
	pages = {252{\textendash}257},
	author = {Koumboulis, FN and Skarpetis, MG and Tzamtzi, MP}
}
