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Bruschi, M., Ragnisco, O. Existence of a Lax pair for any member of the class of nonlinear evolution equations associated to the matrix Schrödinger spectral problem. Lett. Nuovo Cimento 29, 321–326 (1980). https://doi.org/10.1007/BF02745063
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DOI: https://doi.org/10.1007/BF02745063