Omar Mohsen's course at College de France, March 2025
https://www.college-de-france.fr/en/agenda/guest-lecturer/on-maximal-hypoellipticity-and-sub-riemannian-geometry/on-maximal-hypoellipticity-and-sub-riemannian-geometry-1
https://www.college-de-france.fr/en/agenda/guest-lecturer/on-maximal-hypoellipticity-and-sub-riemannian-geometry/on-maximal-hypoellipticity-and-sub-riemannian-geometry-1