@article{MAN_1954__128_160406,
     author = {H.O. Cordes},
     title = {\"Uber die {Spektralzerlegung} von hypermaximalen {Operatoren,} die durch {Separation} der {Variablen} zerfallen. {I.} {Mitteilung.}},
     journal = {Mathematische Annalen},
     pages = {257--289},
     publisher = {mathdoc},
     volume = {128},
     year = {1954},
     zbl = {0064.11703},
     url = {http://geodesic.mathdoc.fr/item/MAN_1954__128_160406/}
}