This work was supported by the Mathematical Center in Akademgorodok; agreement
with the Ministry of Science and Higher Education of the Russian Federation
no. 075-15-2022-281.
Citation:
M. B. Karmanova, “Sub-Riemannian Co-Area Formula for Classes of Noncontact Mappings of Carnot Groups”, Mat. Zametki, 114:6 (2023), 940–944; Math. Notes, 115:3 (2024), 439–443