@article{JRAM_1968__232_150874,
     author = {Gottfried K\"othe},
     title = {Die {Bildr\"aume} abgeschlossener {Operatoren.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {110--111},
     publisher = {mathdoc},
     volume = {232},
     year = {1968},
     zbl = {0157.21003},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1968__232_150874/}
}