@article{ZNSL_2009_370_a1,
     author = {M. N. Demchenko},
     title = {On a partially isometric transform of divergence free vector fields},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {22--43},
     publisher = {mathdoc},
     volume = {370},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2009_370_a1/}
}