@article{MAN_1940__117_160054,
     author = {Rellich. Fr.},
     title = {St\"orungstheorie der {Spektralzerlegung.} {IV.}},
     journal = {Mathematische Annalen},
     pages = {356--382},
     publisher = {mathdoc},
     volume = {117},
     year = {1940},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1940__117_160054/}
}