@article{DAN_1982_265_4_a3,
     author = {B. A. Dubrovin},
     title = {Analytical properties of spectral data for nonselfadjoint linear operators connected with real periodic solutions of the {sine-Gordon} equation},
     journal = {Doklady Akademii Nauk},
     pages = {789--793},
     publisher = {mathdoc},
     volume = {265},
     number = {4},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1982_265_4_a3/}
}