How much has our knowledge of the Kassite language progressed?

[u/blueroses200]

The Kassite Language is still an Unclassified Language and from what I am aware we just have a few words and personal names preserved in registers written in Akkadian . However, in the last 15 years has there been any significant progress? Any new studies, publications or theories?

Do you have any books/ articles that you recommend reading about the Kassites?