%0 Journal Article %A E. M. Jager %A A. Sevink %T A prolongation structure for the nonlinear Schrödinger equation %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1994 %P 292-306 %V 203 %U http://geodesic.mathdoc.fr/item/TM_1994_203_a26/ %G en %F TM_1994_203_a26