TY  - JOUR
AU  - M. B. Karmanova
TI  - Sub-riemannian properties of the level sets of noncontact mappings of Heisenberg groups
JO  - Matematičeskie trudy
PY  - 2022
SP  - 107
EP  - 125
VL  - 25
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MT_2022_25_2_a3/
LA  - ru
ID  - MT_2022_25_2_a3
ER  -