The author of TECO, Dan Murphy, wrote an article about its history for the IEEE Annals of the History of Computing. A PDF copy of the article is available here: https://opost.com/tenex/anhc-31-4-anec.pdf
Alas, it does not discuss the gap buffer.
The book The Craft of Text Editing claims the gap buffer technique was first used by TECO (http://www.finseth.com/craft/#c6.6), although this claim is given no support.
Alas, it does not discuss the gap buffer.
The book The Craft of Text Editing claims the gap buffer technique was first used by TECO (http://www.finseth.com/craft/#c6.6), although this claim is given no support.