MathSciNet bibliographic data MR1422837 (97k:58082) 58F07 (35Q51) Ma, W. X.; Fuchssteiner, B.; Oevel, W. A $3\times 3$$3\times 3$ matrix spectral problem for AKNS hierarchy and its binary nonlinearization. Phys. A 233 (1996), no. 1-2, 331–354. Article

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