D. Barilari, T. Bossio:
Steiner and tube formulae in 3D contact sub-Riemannian geometry
Communication in Contemporary Mathematics (Accepted Paper) http://arxiv.org/abs/2302.01256 2023

T. Bossio, L. Rizzi, T. Rossi:
Tubes in sub-Riemannian geometry and a Weyl's invariance result for
  curves in the Heisenberg groups
(preprint) http://arxiv.org/abs/2408.16838 2024

D. Barilari, T. Bossio, V. Franceschi:
Magnetic fields on sub-Riemannian manifolds
(Preprint) p. 27, 2025