@article{FPM_2010_16_1_a10,
     author = {A. K. Rybnikov},
     title = {B\"acklund maps and {Lie--B\"acklund} transformations as differential-geometric structures},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {135--150},
     publisher = {mathdoc},
     volume = {16},
     number = {1},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2010_16_1_a10/}
}