@article{ND_2006_2_4_a7,
     author = {Hermann von Helmholtz},
     title = {On integrals of the hydrodynamical equations, which express vortex-motion},
     journal = {Russian journal of nonlinear dynamics},
     pages = {473--507},
     publisher = {mathdoc},
     volume = {2},
     number = {4},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ND_2006_2_4_a7/}
}