@Misc{ 
  Bor23,
  author = { Borza, Samuël },
  title = { Normal forms for the sub-Riemannian exponential map of
  $\mathbb{G}_α$, $\mathrm{SU}(2)$, and $\mathrm{SL}(2)$ },
  journal = {  },
  year = { 2023 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/6742/ },
  note = { cvgmt preprint}
}