@article{TMF_1983_56_3_a5,
     author = {W. I. Fushchych and V. M. Shtelen'},
     title = {Linear and nonlinear systems of differential equations invariant with respect to the {Schr\"odinger} group},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {387--394},
     year = {1983},
     volume = {56},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1983_56_3_a5/}
}