@article{MAN_1986__274_164090,
     author = {J. Sol\`a-Morales},
     title = {Global {Instability} and {Essential} {Spectrum} in {Semilinear} {Evolution} {Equations.}},
     journal = {Mathematische Annalen},
     pages = {125--132},
     publisher = {mathdoc},
     volume = {274},
     year = {1986},
     zbl = {0567.35042},
     url = {http://geodesic.mathdoc.fr/item/MAN_1986__274_164090/}
}