The University of Vienna department of Linguistics have an active and productive team working in CLIL.
They have produced a number of interesting collections of articles online. While the materials seem to move location over the years, with a search you can still find them via their website:
Christiane Dalton-Puffer works from here, and if you're not familiar with her book on language in CLIL Classrooms in Austria. It's a good source of data on how language works in CLIL classrooms and how it is used in Austria specifically.