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@article{DOCMA_2005__10__a5, author = {Jakubassa-Amundsen, D.H.}, title = {Localization of the essential spectrum for relativistic $N$-electron ions and atoms}, journal = {Documenta mathematica}, pages = {417--445}, publisher = {mathdoc}, volume = {10}, year = {2005}, language = {en}, url = {http://geodesic.mathdoc.fr/item/DOCMA_2005__10__a5/} }
Jakubassa-Amundsen, D.H. Localization of the essential spectrum for relativistic $N$-electron ions and atoms. Documenta mathematica, Tome 10 (2005), pp. 417-445. http://geodesic.mathdoc.fr/item/DOCMA_2005__10__a5/