@article{DAN_1969_184_2_a13,
     author = {A. M. Obukhov},
     title = {Integral invariants in hydrodynamic systems},
     journal = {Doklady Akademii Nauk},
     pages = {309--312},
     publisher = {mathdoc},
     volume = {184},
     number = {2},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_184_2_a13/}
}