Duden reconfirmed as standard for spelling

1955

In 1955 the ministers of culture of the states of Germany confirmed the spellings given by the Duden would continue to be the official standard.

Sources

https://en.wikipedia.org/wiki/Duden

Referred to in

Duden Wörterbuch
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PublishedNovember 30, 2020
Excerpt

The Duden is a dictionary of the German language, and has long been the prescriptive source of German regarding grammar and spelling. It was first published by Konrad Duden in 1880, with regular updates every four or five years. The current edition published in 2020 is the 28th. The Duden dictionary is also available online.

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