@article{DAN_1976_230_1_a4,
     author = {N. H. Ibragimov},
     title = {Lie--B\"acklund groups and conservation laws},
     journal = {Doklady Akademii Nauk},
     pages = {26--29},
     publisher = {mathdoc},
     volume = {230},
     number = {1},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_230_1_a4/}
}