IEEE Transactions on Automatic Control, Vol.50, No.12, 2097-2101, 2005
A class of globally output feedback stabilizable nonlinear nonminimum phase systems
It is shown that any observable nonlinear system in output feedback form can be globally exponentially stabilized by a dynamic output feedback controller, provided that it is minimum phase with respect to a linear combination of its state variables, even though it is nonminimum phase with respect to the measured output.