@article{DE_1988_24_12_a20,
     author = {S. V. Zhestkov},
     title = {Doubly periodic solutions of quasilinear hyperbolic partial differential systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2164--2166},
     publisher = {mathdoc},
     volume = {24},
     number = {12},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1988_24_12_a20/}
}