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We obtain a class of soliton solutions of the integrable hierarchy which has been put forward in a series of works by Z. Qiao. The soliton solutions are in the class of real functions approaching constant value fast enough at infinity, the so-called 'dark solitons'.
R. Ivanov and T. Lyons, Dark solitons of the Qiao’s hierarchy, Journal of mathematical physics. 53, 123701 (2012). doi:10.21427/a82a-5253