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Translated from Matematicheskie Zametki, Vol. 49, No. 6, pp. 42–58, June, 1991.
We would like to thank O. S. Ryzhov for his discussion of the statement of this problem.
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Dobrokhotov, S.Y., Krichever, I.M. Multi-phase solutions of the Benjamin-Ono equation and their averaging. Mathematical Notes of the Academy of Sciences of the USSR 49, 583–594 (1991). https://doi.org/10.1007/BF01156581
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DOI: https://doi.org/10.1007/BF01156581