Me too; I have had the tab open months, or years at this point.
http://prog21.dadgum.com/114.html - "Papers from the lost culture of Array Languages" - has links to this and a couple more interesting sounding things.
I've read and re-read "Notation as a Tool of Thought" ever since I came across it, one of my favorite papers.
Thank you for the link to this other paper, I can branch out to discover related works. Just found this one, I'll chew it well: "Language as an intellectual tool: From hieroglyphics to APL" [0].
http://prog21.dadgum.com/114.html - "Papers from the lost culture of Array Languages" - has links to this and a couple more interesting sounding things.