@article{IVM_1992_11_a8,
     author = {A. L. Sakhnovich},
     title = {The {Goursat} problem for the {sine-Gordon} equation, and an inverse spectral problem},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {44--54},
     publisher = {mathdoc},
     number = {11},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1992_11_a8/}
}