Emmanuel Trélat, 273, Dynamics, Bifurcations, and Control, 2002, 89
Andrei A. Agrachev, Francesco Boarotto, “Normal forms for the endpoint map near nice singular curves for rank-two distributions”, ESAIM: COCV, 27, 2021, S30
E. Trélat, “Some Properties of the Value Function and Its Level Sets for Affine Control Systems with Quadratic Cost”, Journal of Dynamical and Control Systems, 6, no. 4, 2000, 511
A.A. Agrachev, “Feedback-Invariant Optimal Control Theory and Differential Geometry, II. Jacobi Curves for Singular Extremals”, Journal of Dynamical and Control Systems, 4, no. 4, 1998, 583
I. Zelenko, “Nonregular Abnormal Extremals of 2-Distribution: Existence, Second Variation, and Rigidity”, Journal of Dynamical and Control Systems, 5, no. 3, 1999, 347
A.I. Tretyak, “Chronological Calculus, High-Order Necessary Conditions for Optimality, and Perturbation Methods”, Journal of Dynamical and Control Systems, 4, no. 1, 1998, 77
E. Trélat, B. Bonnard, G. Launay, “The Transcendence Needed to Compute the Sphere and the Wave Front in Martinet SR-Geometry”, Journal of Mathematical Sciences, 103, no. 6, 2001, 686
A. V. Dmitruk, “Quadratic Sufficient Minimality Conditions for Abnormal Sub-Riemannian Geodesics”, Journal of Mathematical Sciences, 104, no. 1, 2001, 779
B. Bonnard, E. Trélat, “On the role of abnormal minimizers in sub-riemannian geometry”, Annales de la Faculté des sciences de Toulouse : Mathématiques, 10, no. 3, 2001, 405