Rong-Yao Ruan Ren-Liang Pan Chang-Li Yang Adaptive output-feedback tracking control for uncertain nonlinear systems. 24-29 2004 ICARCV http://dx.doi.org/10.1109/ICARCV.2004.1468792 conf/icarcv/2004 db/conf/icarcv/icarcv2004.html#RuanPY04