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\bibitem{Smondyrev_etal1995} {\textquotedblleft}\textit{Nonlinear Schr{\"o}dinger equation on a circle}{\textquotedblright}. Smondyrev MA, Vansant P, Peeters FM, Devreese JT, Physical review : B : condensed matter and materials physics \textbf{52}, 11231 (1995).   http://doi.org/10.1103/PhysRevB.52.11231

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