This is purely subjective, but Google is the only one that links to the Netlib 'real' LAPACK, straight to the file/documentation in question. The others have mixtures of Java packages and other examples...
Basically, but you're getting the opinion of a random person on the internet :). The third result is the 'real' one (the top two are unit tests for the named function.
http://searchco.de/?q=DGGEVX&cs=on