@article{GDZPPN002277263, title = {Spektraltheorie in nichtseparabeln R\"aumen.}, journal = {Mathematische Annalen}, volume = {111}, year = {1935}, pages = {342-356}, zbl = {60.0325.02}, url = {http://dml.mathdoc.fr/item/GDZPPN002277263} }
Rellich, F. Spektraltheorie in nichtseparabeln Räumen.. Mathematische Annalen, Tome 111 (1935) pp. 342-356. http://gdmltest.u-ga.fr/item/GDZPPN002277263/