zettelkasten.de
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The site has a blog, a forum and a course. Its authors also make The Archive, a note-taking app, and wrote the book “The Zettelkasten Method”.
On 31 October 2022 the site published Sascha Fast’s English translation of all 18 cards from sequence 9/8 of Luhmann’s second slip-box. The original cards are in the Niklas Luhmann-Archiv.
In my articles
I cite this translation in both parts of my second brain series, because sequence 9/8 shows Luhmann’s card numbering most clearly.
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All entriesNiklas Luhmann-Archiv
The Niklas Luhmann-Archiv is an online portal to Niklas Luhmann's slip-box, with scans of his manuscripts, transcriptions and recordings. It is being built at Bielefeld University.