This paper details a novel algorithm for comparison of suspect documents at a sentence level and has been implemented as a component of plagiarism detection software for detecting similarities in both natural language documents and comments within program source-code.

You might need an acm login?

It could be useful to implement a plagiarism detection system for conference papers. ;-) I remember we use to manually find copied papers on the net during Vidyakash 2002/KBCS 2002 conferences.