@article{TMF_1992_91_2_a5,
     author = {A. G. Nikitin and S. P. Onufriichuk and W. I. Fushchych},
     title = {Higher symmetries of the {Schr\"odinger} equation},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {268--278},
     year = {1992},
     volume = {91},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1992_91_2_a5/}
}