@article{MAN_1941__118_160101,
     author = {F. Rellich},
     title = {St\"orungstheorie der {Spektralzerlegung.} {V.}},
     journal = {Mathematische Annalen},
     pages = {462--484},
     year = {1941},
     volume = {118},
     url = {http://geodesic.mathdoc.fr/item/MAN_1941__118_160101/}
}