1. National Information Standard Organization (NISO).ANSI Z39.50: Information Retrieval Service and Protocol (1992)
2. The Open Archives Initiative Protocol for Metadata Harvesting protocol version 2.0, http://www.openarchives.org/OAI/2.0/openarchivesprotocol.htm
3. Fang, L.: Library of Central China Normal University. A Developing Search Service - Heterogeneous Resources Integration and Retrieval System. D-Lib Magazine 10(3) (March 2004)
4. Kushmerick, N., Weld, D., Doorenbos, R.: Wrapper induction for information extraction. In: IJCAI 1997 (1997), http://sherry.ifi.unizh.ch/kushmerick97wrapper.html
5. Zhao, H., Meng, W., Wu, Z., Raghavan, V., Yu, C.: Fully Automatic Wrapper Generation for Search Engines. In: Proc. of 14th International World Wide Web Conference (WWW14), Chiba, Japan, May 2005, pp. 66–75 (2005)