1. D. Aeyels, “Stabilization of a Class of Nonlinear Systems by a Smooth Feedback Control”, Syst. amp Control Letters, v. 5, 1985, pp. 289–294.
2. R. M. BIANCHINI and G. STEFANI, “Local Controllability about a Reference Trajectory”, Analysis and Optimization of Systems, A. Bensoussand & J. L. Lions eds., Lect. Notes Control, v. 83, 1986, Springer.
3. G. BIRKHOFF and G.-C. ROTA, Ordinary Differential Equations, BlaisdeU Publ., 1962.
4. R. W. BROCKETT, “Asymptotic Stability and Feedback Stabilization”, Differential Geometric Control Theory, R. W. Brockett, R. S. Millmann, and H. J. Sussmann eds., Progress in Mathematics, v. 27, 1983, pp. 181–191.
5. C. I. Byrnes and A. ISIDORI, “The Analysis and Design of Nonlinear Feedback Systems”, to appear in IEEE Transactions Automatic Control.