A. Braides, M. S. Gelli, M. Sigalotti: The passage from non-convex discrete systems to variational problems in Sobolev spaces: the one-dimensional case Proc. Steklov. Math. Inst. Vol. 236, p. 395-414, 2002 D. Barilari, U. Boscain, E. Le Donne, M. Sigalotti: Sub-Finsler structures from the time-optimal control viewpoint for some nilpotent distributions Journal of Dynamical and Control Systems 2016 (editors), D. Barilari, U. Boscain, M. Sigalotti: Dynamics, geometry and analysis on sub-Riemannian manifolds, vol. I and vol. II EMS Series of Lectures in Mathematics (Lecture Notes) 2016 D. Barilari, Y. Chitour, F. Jean, D. Prandi, M. Sigalotti: On the regularity of abnormal minimizers for rank 2 sub-Riemannian structures Journal de Mathématiques Pures et Appliquées 2020 V. Franceschi, R. Monti, A. Righini, M. Sigalotti: The isoperimetric problem for regular and crystalline norms in $\mathbb H^1$ Journal of Geometric Analysis 2020 U. Boscain, D. Cannarsa, V. Franceschi, M. Sigalotti: Local controllability does imply global controllability (Preprint) 2021