@article{ZNSL_1984_133_a7,
     author = {A. R. Its},
     title = {Liouville's theorem and the inverse scattering method},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {113--125},
     year = {1984},
     volume = {133},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1984_133_a7/}
}