Notes Raft - How to Build a Habit of Writing Evergreen Notes<br /> by Haikal Kushahrin

Luhmann with focus on "Matuschak's evergreen notes".

http://rachelcritelli.com/blog/implementing-my-analog-zettelkasten/

another one pager on zettelkasten, though this one has at least a handful of the most common modern references

https://mattgiaro.com/obsidian-zettelkasten/

Yet another short, one-pager blogpost about zettelkasten

https://prosimpli.com/index-card-holder/

Reasonable state-of-the-art of index card holders. Does manage to leave out some of the bleacher display methods, but otherwise not bad.

https://www.bisley.sk/userfiles/bisley/product/e84b22bf2d7156d048ad076ff74f895d.pdf

https://www.nz.histinst.rwth-aachen.de/go/id/datdr

related: https://link.springer.com/referenceworkentry/10.1007/978-3-658-27798-7_4-1