"Syntactic Clustering of the Web"
Andrei Z. Broder, Steven C. Glassman, Mark S. Manasse, Geoffrey Zweig
Note #1997-015. July 25, 1997

We have developed an efficient way to determine the syntactic similarity
of files and have applied it to every document on the World Wide Web.
Using this mechanism, we built a clustering of all the documents that are
syntactically similar. Possible applications include a "Lost and Found"
service, filtering the results of Web searches, updating widely distributed
web-pages, and identifying violations of intellectual property rights.