%0 Journal Article
%A E. A. Kudryavtseva
%T Helicity is the Only Invariant of Incompressible Flows whose Derivative is Continuous in the $C^1$ Topology
%J Matematičeskie zametki
%D 2016
%P 626-630
%V 99
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_2016_99_4_a15/
%G ru
%F MZM_2016_99_4_a15