Looking For FACS Information

Hello,

I’d really like to learn more about FACS-based facial rigging and was wondering if anyone has any particularly good resources, information, workflow tips?

Here are the ones I found: Wikipedia page, scientific paper on FACS

Obviously there’s also the FACS book but it isn’t free.

Also, what other facial shapes are required for cartoony FACS-based rigging? For example I saw a demonstration of Pixar’s Presto and they have shapes for twisting the mouth, moving it up/down and in/out.

Thanks,
-Harry