The original article that describes differential fuzzing for compilers is from 1998. In addition, that article is extremely readable:
https://pdfs.semanticscholar.org/fc88/1e8d0432ea8e4dd5fda497...
https://pdfs.semanticscholar.org/fc88/1e8d0432ea8e4dd5fda497...
I built an implementation of this method around 1992-93.