@article{TMF_1998_114_1_a5,
     author = {I. T. Habibullin},
     title = {Sine-Gordon equation on the semi-axis},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {115--125},
     publisher = {mathdoc},
     volume = {114},
     number = {1},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1998_114_1_a5/}
}