1. Isidori A.Nonlinear Control Systems, An Introduction[M]. Vol72, Berlin: Springer-Verlag, 1985.
2. CHEN Dai-zhan.Geometry Theory of Nonlinear System[M]. Beijing: Science Press, 1988. (in Chinese)
3. CHEN Dai-zhan, et al. The researching tendency and prospect of nonlinear system[J].J Control & Decision, 1991,6(5):394–400. (in Chinese)
4. Hermann R, Krener A J. Nonlinear controllability and observability[J].IEEE Transactions Automatic Control, 1977, AC-22(5):728–740.
5. Sussmann H J, Jurdjevic V. Controllability of nonlinear systems [J].J Differential Equations, 1972,12(3):313–329.