%0 Journal Article %A J. SolĂ -Morales %T Global Instability and Essential Spectrum in Semilinear Evolution Equations. %J Mathematische Annalen %D 1986 %P 125-132 %V 274 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1986__274_164090/ %F MAN_1986__274_164090