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{{cite web |url=https://marcus.uib.no/instance/reference/b89aa7f0086a08fb1acdb4da7e3ae2acf0ae3c4f |title=ubb-kk-n-276-004: Hundre elektriske år... (s. 69) |author=Avdeling for spesialsamlinger |accessdate=Thu Apr 25, 2024 |publisher=University of Bergen Library}}