There are some articles on plain text CRDTs on my academic homepage [1]. Causal Trees are the same family as WOOT, Logoot and TreeDoc.

Also, we did a RichText implementation for one-$10bn-company-that-forbids-to-mention-its-name-too-often. I did not publish that yet.

[1]: http://www.pds.ewi.tudelft.nl/~victor/

Love to see it when you've published! I've thought briefly what a rich-text implementation of causal trees might look like…but it hasn't bubbled to the top of my priority list yet.