https://forum.zettelkasten.de/discussion/2597/new-book-personal-knowledge-graphs-by-ivo-velitchkov#latest

For some additional context the work can be found through https://personalknowledgegraphs.com/#/page/pkg. It also has portions of the building of the book which exist as a knowledge graph, though it doesn't appear that they put up the entirety of the book as a linked knowledge graph the way they had initially planned. I've read a few parts in draft form, including Flancian's chapter whose ideas are tremendous, but I have yet to read the remainder of the published work.

[Disclosure: I had submitted and had been accepted to write an early, historical-flavored chapter for this volume, but ultimately fell out, as did many others, over disagreements regarding their editing and/or publishing process. I'm close with Flancian and appreciate his experimental programming work on https://anagora.org/index, which one might call a multi-layered wiki of personal wikis, commonplace books, zettelkasten, diaries, notes, and other similar forms of personal knowledge. If you've got a public, digitally available version of a zettelkasten you'd like to add to his project, do reach out to him to interconnect it with the Agora and others' work there.]

The Agora: a Knowledge Commons By: Eduardo Ivanec a.k.a. @flancian Go link: https://anagora.org/go/agora-chapter

https://docs.google.com/document/d/1DXJRDh9Ss5VCRBi3oirDw9d7yjn3H2hMqfN2ETTyjIc/edit#heading=h.lxyhsegwtr4m

Lima, Manuel. The Book of Trees: Visualizing Branches of Knowledge, 2014. https://papress.com/products/the-book-of-trees-visualizing-branches-of-knowledge.

https://personalknowledgegraphs.com/#/page/Personal%20Knowledge%20Graphs