1. Introduction to Differentiable Manifolds;Auslander,1963
2. Nonlinear Systems and Differential Geometry;Brockett;IEEE Proceedings,1976
3. The Geometry of the Set of Controllable Linear Systems;Brockett,1977
4. A Classification of Linear Controllable Systems;Brunovsky;Kibernetika,1970
5. On the Accessibility Problem in Control Theory;Hermann,1963