You may give http://www.plre.org/ or http://www.cdiggins.com/search/ a try to see if it helps.

From the second link: "(PLRE.org) is a custom search engine created using the Google co-op service.

The PLRE is designed primarily for researchers, students, language designers, and language implementers who need reputable sources for advanced or esoteric information pertaining to programming languages. This site has a heavy emphasis on advanced topics in programming language theory, but can be useful to find languages with particular features."