%0 Journal Article
%A M. B. Karmanova
%T Sub-riemannian properties of the level sets of noncontact mappings of Heisenberg groups
%J Matematičeskie trudy
%D 2022
%P 107-125
%V 25
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MT_2022_25_2_a3/
%G ru
%F MT_2022_25_2_a3