@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/}
}