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4. A. A. Agrachev, Symplectic methods for optimization and control (to appear in: Geometry of Feedback and Optimal Control, B. Jakubczyk and W. Respondek. Eds,Marcel Dekker).
5. A. A. Agrachev, R. V. Gamkrelidze, and A. V. Sarychev, Local invariants of smooth control systems.Acta Appl. Math. 14 (1989), 191–237.