%0 Journal Article %A V. V. Kozlov %T Linear systems with quadratic integral and complete integrability of the Schr\"odinger equation %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 2019 %P 959-961 %V 74 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_2019_74_5_a9/ %G en %F RM_2019_74_5_a9