Boscain U, Charlot G, Ghezzi R, Sigalotti M. Lipschitz Classification of Almost-Riemannian Distances on Compact Oriented Surfaces. Journal of Geometric Analysis [Internet]. 2013  ;23:438?455. Available from: https://doi.org/10.1007/s12220-011-9262-4

Ghezzi R, Remizov AO. On a class of vector fields with discontinuity of divide-by-zero type  and its applications. Journal of dynamical and control systems . 2012  ;18(1 ):135-158.

Bonnard B, Charlot G, Ghezzi R, Janin G. The sphere and the cut locus at a tangency point in two-dimensional almost-Riemannian geometry. Journal of Dynamical and Control Systems  [Internet]. 2011  ;17 :141-161. Available from: http://hdl.handle.net/1963/4914

Ghezzi R. Almost-Riemannian Geometry from a Control Theoretical Viewpoint.  [Internet]. 2010  . Available from: http://hdl.handle.net/1963/4705

Boscain U, Charlot G, Ghezzi R. A normal form for generic 2-dimensional almost-Riemannian structures at a tangency point. arXiv preprint arXiv:1008.5036. 2010  .

Agrachev AA, Boscain U, Charlot G, Ghezzi R, Sigalotti M. Two-dimensional almost-Riemannian structures with tangency points. Ann. Inst. H. Poincare Anal. Non Lineaire  [Internet]. 2010  ;27:793-807. Available from: http://hdl.handle.net/1963/3870