@article{DAN_1996_351_5_a4,
     author = {L. V. Ovsyannikov},
     title = {Invariant integral conservation laws},
     journal = {Doklady Akademii Nauk},
     pages = {599--602},
     year = {1996},
     volume = {351},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1996_351_5_a4/}
}