@article{TMF_1991_89_3_a0,
     author = {V. E. Adler},
     title = {Lie-algebraic approach to nonlocal symmetries of integrable systems},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {323--336},
     publisher = {mathdoc},
     volume = {89},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1991_89_3_a0/}
}