@article{SM_1991_70_1_a13,
     author = {A. O. Smirnov},
     title = {Real elliptic solutions of the {``sine-Gordon''} equation},
     journal = {Sbornik. Mathematics},
     pages = {231--240},
     publisher = {mathdoc},
     volume = {70},
     number = {1},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1991_70_1_a13/}
}