What do you get out of Luhmann’s paper if you leave aside for the moment all the technology of cards, slip boxes, indexes, links, and back links?

What remains is still the core of something powerful.

The paper is called “𝘊𝘰𝘮𝘮𝘶𝘯𝘪𝘤𝘢𝘵𝘪𝘯𝘨 with Slip Boxes” …