References
Li Yishen and Gu Xinshen, Darboux Transformations Associated with Boiti-Tu Eigenvalue Problem, to be submitted toChin. Ann. Math., 1984.
Li Yishen, Some Relation Formulas Deduced from the Structure Equation of theSL(2,R) Group,Journal of China University of Science and Technology,15(1985), Math. Issue (in Chinese).
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Yishen, L., Xinshen, G. & Maorong, Z. Three kinds of Darboux transformation for the evolution equations which connect with A.K.N.S. eigenvalue problem. Acta Mathematica Sinica 3, 143–151 (1987). https://doi.org/10.1007/BF02565027
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DOI: https://doi.org/10.1007/BF02565027