%0 Journal Article %A S. V. Zhestkov %T Doubly periodic solutions of quasilinear hyperbolic partial differential systems %J Differencialʹnye uravneniâ %D 1988 %P 2164-2166 %V 24 %N 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1988_24_12_a20/ %G ru %F DE_1988_24_12_a20