There's a blog by a (German?) scholar that covers all kinds of Zettelkastens extensively. Apparently the author is heavily inspired by the method of the german

There's a blog by a (German?) scholar that covers all kinds of Zettelkastens extensively. Apparently the author is heavily inspired by the method of the german sociologist Niklas Luhmann: https://takingnotenow.blogspot.com/2007/12/luhmanns-zettelkasten.html https://takingnotenow.blogspot.com/2007/12/luhmanns-zettelka... https://takingnotenow.blogspot.com/2016/09/luhmanns-zettelkaste-described.html https://takingnotenow.blogspot.com/2016/09/luhmanns-zettelka... https://takingnotenow.blogspot.com/2016/08/my-translations-of-luhmann_6.html https://takingnotenow.blogspot.com/2016/08/my-translations-o... And, just for quick reference, his entire 'zettelkasten' tag: https://takingnotenow.blogspot.com/search/label/Zettelkasten https://takingnotenow.blogspot.com/search/label/Zettelkasten