Many libraries and databases are closed to general-purpose Web crawlers, and they expose their content only through their own search engines. At the same time many researchers attempt to locate technical papers through general-purpose Web search engines. DP9 is an open source gateway service that allows general search engines, (e.g. Google, Inktomi) to index OAI-compliant archives. DP9 does this by providing consistent URLs for repository records, and converting them to OAI queries against the appropriate repository when the URL is requested. This allows search engines that do not support the OAI protocol to index the "deep Web" contained within OAI compliant repositories.

Note: OCR errors may be found in this Reference List extracted from the full text article. ACM has opted to expose the complete List rather than only correct and linked references.

	1	M. K. Bergman. The Deep Web: Surfacing Hidden Value. Journal of Electronic Publishing, 7(1), 2001
	2	Malika Mahoui , Sally Jo Cunningham, Search Behavior in a Research-Oriented Digital Library, Proceedings of the 5th European Conference on Research and Advanced Technology for Digital Libraries, p.13-24, September 04-09, 2001
	3	Carl Lagoze , Herbert Van de Sompel, The open archives initiative: building a low-barrier interoperability framework, Proceedings of the 1st ACM/IEEE-CS joint conference on Digital libraries, p.54-62, January 2001, Roanoke, Virginia, United States  [doi>10.1145/379437.379449]
	4	X. Liu, K. Maly, M. Zubair, and M. L. Nelson. Arc - An OAI Service Provider for Digital Library Federation, D-Lib Magazine 7(4), April 2001
	5	M. Koster. The Web Robots Page. Available at http://info.webcrawler.com/mak/projects/robots/robots.html
	6	OAI Perl. Available at http://oai-perl.sourceforge.net/

• M⁴: a metamodel for data preprocessing Proceedings of the 4th ACM international workshop on Data warehousing and OLAP
  Anca Vaduva ,  Jörg-Uwe Kietz ,  Regina Zücker
  
  
• Data structures for quadtree approximation and compression Communications of the ACM   28, 9
  Hanan Samet
  
  
• A hierarchical single-key-lock access control using the Chinese remainder theorem Proceedings of the 1992 ACM/SIGAPP Symposium on Applied computing
  Kim S. Lee ,  Huizhu Lu ,  D. D. Fisher
  
  
• The GemStone object database management system Communications of the ACM   34, 10
  Paul Butterworth ,  Allen Otis ,  Jacob Stein
  
  
• Putting innovation to work: adoption strategies for multimedia communication systems Communications of the ACM   34, 12
  Ellen Francik ,  Susan Ehrlich Rudman ,  Donna Cooper ,  Stephen Levine