Erik Selberg and Oren Etzioni.  Multi-Service Search and  Comparison Using the MetaCrawler.  In both <a  href="http://www.cs.washington.edu/research/projects/softbots/www/metacrawler.ps">Postscript</a>  and <a  href="http://www.cs.washington.edu/research/projects/softbots/papers/metacrawler/www4/html/Overview.html">HTML</a>  In <EM> Proc. 4th World Wide Web Conf.</EM>, pages 195--208,  1995.</P>
