%0 Journal Article %A W. I. Fushchych %A V. M. Shtelen' %T Linear and nonlinear systems of differential equations invariant with respect to the Schr\"odinger group %J Teoretičeskaâ i matematičeskaâ fizika %D 1983 %P 387-394 %V 56 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1983_56_3_a5/ %G ru %F TMF_1983_56_3_a5