L. Ambrosio, G. Somma, S. Verzellesi, D. Vittone:
Renormalization of contact vector fields with horizontal Sobolev regularity in Heisenberg groups
(Preprint) http://arxiv.org/abs/2602.00804 2026

M. Di Marco, G. Somma, D. Vittone:
A note on the diameter of small sub-Riemannian balls
Anal. Geom. Metr. Spaces Vol. 14, N. 1, p. Paper No. 20250037, 2026