Hey, the author of the piece. For context here: I included the link to the 1973 abstract rather than the 1974 document because it was the first mention of UNIX

Hey, the author of the piece. For context here: I included the link to the 1973 abstract rather than the 1974 document because it was the first mention of UNIX in the ACM archive, which I made clear in the piece but got a little lost in the comment here.