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==Sources==
{{sfn whitelist|CITEREFKubrusly2011}}
* {{cite book|last=Blatter|first=Christian|title=Analysis II (2nd ed.)|publisher=Springer Verlag|year=1979|language=German|isbn=3-540-09484-9|pages=188|chapter=20. Mehrdimensionale Differentialrechnung, Aufgaben, 1.}}
* {{Kubrusly The Elements of Operator Theory 2nd Edition 2011}} <!--{{sfn|Kubrusly|2011|p=}}-->
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