Qing Zhu Tianping Zhang Shumin Fei Kan-Jian Zhang Tao Li Adaptive neural control for a class of output feedback time delay nonlinear systems. 1985-1992 2009 72 Neurocomputing 7-9 http://dx.doi.org/10.1016/j.neucom.2008.12.023 db/journals/ijon/ijon72.html#ZhuZFZL09