@article{MAN_1939__116_160009,
     author = {F. Wecken},
     title = {Unit\"arinvarianten selbstadjungierter {Operatoren}},
     journal = {Mathematische Annalen},
     pages = {422--455},
     publisher = {mathdoc},
     volume = {116},
     year = {1939},
     zbl = {0020.30501},
     url = {http://geodesic.mathdoc.fr/item/MAN_1939__116_160009/}
}