The best current resource is the Kyle Gann book, "The Arithmetic of Listening". It's fantastic, by a world authority on the topic. https://www.kylegann.com/Gannbooks.html
Also for anyone interested in just intonation based microtonality, I did a video demo of a tool I made using my open source Scheme for Max extension to Max here:
Kyle Gann's Arithmetic of Listening goes deeply into this. Given an infinite number of ways of dividing the range from f to 2f, some other equal-division temperaments (31 or 53, for example) get closer than 12TET to maintaining low-integer ratios across key centers, but each additional pitch adds complexity. I'd recommend that book in particular. https://www.kylegann.com/Gannbooks.html