Geodesic
Discrete Zakharov--Shabat systems and integrable equations
Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part VII, Tome 146 (1985), pp. 137-146

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The method of dressing transformations is generalized to the case of discrete spectral problems. As a result, new differentialdifference analogs of the nonlinear integrable equations (e.g. the sine-Gordon equation, the vector nonlinear Schroedinger equation and the $N$-wave system) are obtained. Bibl. – 11. 
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     author = {I. T. Habibullin},
     title = {Discrete {Zakharov--Shabat} systems and integrable equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {137--146},
     publisher = {mathdoc},
     volume = {146},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1985_146_a8/}
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I. T. Habibullin. Discrete Zakharov--Shabat systems and integrable equations. Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part VII, Tome 146 (1985), pp. 137-146. http://geodesic.mathdoc.fr/item/ZNSL_1985_146_a8/