@article{ZNSL_1985_146_a8,
     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/}
}