@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/}
}