@article{ZNSL_1980_96_a12,
     author = {P. P. Kulish},
     title = {Generating operators for integrable nonlinear equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {105--112},
     publisher = {mathdoc},
     volume = {96},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1980_96_a12/}
}