@article{FAA_1982_16_1_a4,
     author = {B. A. Dubrovin and S. M. Natanzon},
     title = {Real two-zone solutions of the {sine-Gordon} equation},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {27--43},
     publisher = {mathdoc},
     volume = {16},
     number = {1},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1982_16_1_a4/}
}