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Himonas and Misiolek (Communications in Partial Differential Equations, 23(1998), 123-139.) have proved that the problem is locally well-posed for small initial data in H^{s}(\\mathbf{T}) with s\\geq-\\frac{j}{2}+1,j\\in N^{+} with the aid of the standard Fourier restriction norm method. 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Himonas and Misiolek (Communications in Partial Differential Equations, 23(1998), 123-139.) have proved that the problem is locally well-posed for small initial data in H^{s}(\\mathbf{T}) with s\\geq-\\frac{j}{2}+1,j\\in N^{+} with the aid of the standard Fourier restriction norm method. 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