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Omsk. Translated from Sibirskiî Matematicheskiî Zhurnal, Vol. 40, No. 2, pp. 439–442, March–April, 1999.
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Romanovskiî, R.K., Sadovnichuk, S.G. Effective construction of two-gap solutions to the nonlinear Schrödinger equation. Sib Math J 40, 378–381 (1999). https://doi.org/10.1007/s11202-999-0017-4
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DOI: https://doi.org/10.1007/s11202-999-0017-4