%0 Journal Article %A Pavel Krejci %T Hysteresis and Periodic Solutions of Semilinear and Quasilinear Wave Equations. %J Mathematische Zeitschrift %D 1986 %P 247-264 %V 193 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1986__193_173782/ %F MZ_1986__193_173782