Media type: E-Article Title: Essential Spectrum for Maxwell’s Equations Contributor: Alberti, Giovanni S.; Brown, Malcolm; Marletta, Marco; Wood, Ian imprint: Springer Science and Business Media LLC, 2019 Published in: Annales Henri Poincaré Language: English DOI: 10.1007/s00023-019-00762-x ISSN: 1424-0637; 1424-0661 Keywords: Mathematical Physics ; Nuclear and High Energy Physics ; Statistical and Nonlinear Physics Origination: Footnote: