Nm1997b
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P.I. Naumkin, Asymptotic behavior for large time values of solutions of the nonlinear Schrödinger equation. (Russian) Izv. Ross. Akad. Nauk Ser. Mat. 61 (1997), no. 4, 81-118; translation in Izv. Math. 61 (1997), no. 4, 757-794.