@article{MZM_2016_99_4_a15,
     author = {E. A. Kudryavtseva},
     title = {Helicity is the {Only} {Invariant} of {Incompressible} {Flows} whose {Derivative} is {Continuous} in the $C^1$ {Topology}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {626--630},
     publisher = {mathdoc},
     volume = {99},
     number = {4},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2016_99_4_a15/}
}