http://www.erights.org/history/morris73.pdf http://www.erights.org/history/morris73.pdf is a great follow-up with more code in GEDANKEN. https://www.hackerschoo

http://www.erights.org/history/morris73.pdf http://www.erights.org/history/morris73.pdf is a great follow-up with more code in GEDANKEN. https://www.hackerschool.com/blog/46-paper-of-the-week-on-understanding-data-abstraction-revisited https://www.hackerschool.com/blog/46-paper-of-the-week-on-un... introduces a much more recent essay exploring these ideas about procedural data structures.