Much thanks to Seth Josel and Michelle Lou for including a reference to Tension and Extension in their incredible new compendium of electric guitar techniques The Techniques of E-Guitar Playing on Bärenreiter. https://www.barenreiter.us/products/the-techniques-of-e-guitar-playing-barenreiter
(providing a link to Bärenreiter’s American site since it seems to be the easiest way for Canadians to order a copy)