%0 Journal Article %A A. Ya. Maltsev %T The Lorentz-Invariant Deformation of the Whitham System for the Nonlinear Klein--Gordon Equation %J Funkcionalʹnyj analiz i ego priloženiâ %D 2008 %P 28-43 %V 42 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_2008_42_2_a4/ %G ru %F FAA_2008_42_2_a4