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@article{DAN_1987_297_1_a0, author = {I. Sh. Akhatov and R. K. Gazizov and N. H. Ibragimov}, title = {B\"acklund transforms and nonlocal symmetries}, journal = {Doklady Akademii Nauk}, pages = {11--14}, publisher = {mathdoc}, volume = {297}, number = {1}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1987_297_1_a0/} }
I. Sh. Akhatov; R. K. Gazizov; N. H. Ibragimov. B\"acklund transforms and nonlocal symmetries. Doklady Akademii Nauk, Tome 297 (1987) no. 1, pp. 11-14. http://geodesic.mathdoc.fr/item/DAN_1987_297_1_a0/