@Misc{ 
  AnBaBeRi24,
  author = { Andrei A. Agrachev,  and Baranzini, Stefano and Bellini, Eugenio and Rizzi, Luca },
  title = { Quantitative tightness for three-dimensional contact manifolds: a
  sub-Riemannian approach },
  journal = {  },
  year = { 2024 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/6642/ },
  note = { cvgmt preprint}
}