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