@article{MAN_1962__146_160921,
     author = {H. LANGER},
     title = {Zur {Spektraltheorie} {J-selbstadjungierter} {Operatoren.}},
     journal = {Mathematische Annalen},
     pages = {60--85},
     publisher = {mathdoc},
     volume = {146},
     year = {1962},
     url = {http://geodesic.mathdoc.fr/item/MAN_1962__146_160921/}
}