@article{DAN_1981_257_5_a20,
     author = {W. I. Fushchych and V. A. Vladimirov},
     title = {On the additional invariance of the equations of motion for vector fields},
     journal = {Doklady Akademii Nauk},
     pages = {1105--1109},
     publisher = {mathdoc},
     volume = {257},
     number = {5},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_257_5_a20/}
}