@article{CMA_2015_98_a6,
     author = {A. V. Ovchinnikov},
     title = {On the asymptotic expansion of solutions to the {Goursat} problem for the {sine-Gordon} equation},
     journal = {Contemporary Mathematics and Its Applications},
     pages = {143--148},
     publisher = {mathdoc},
     volume = {98},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMA_2015_98_a6/}
}