1Hussein Suleman and Edward Fox. The open archives initiative:realizing simple and effective digital library interoperability,2001, http://www.dlib. edu/projects/OAI/reports/jla_ 2001 _ article _ oai. pdf.
2Van de Sompel, Herbert and Carl Lagoze. The Santa Fe convention of the Open Archives Initiative. D-Lib Magazine, February 2000.
3Jim Davis, David Fielding, etc. The Open Archives Dienst subset, 2000, http://www. cs. comell. edu/cdlrg/dienst/protocols/openarchivesdienst. htm.
4About Emerge, http://emerge. ncsa.uine. edu/.
5Linda Bird, Andrew Goodchild and Sonya Finnigan. Querying heterogeneous databases using standardized schemas and SQL.proceedings of 10^th Australasian database conference, Auckland,New Zealand,January 1999,49 - 63.
6Jim Davis, David Fielding, etc. Dienst protocol specification,2000, http ://www. cs. cornell. edu/cdlrg/dienst/protocols/dienstprotocol. htm.
7The simple digital library interoperability protocol(SDLIP), Stanford University, USA, 2000, http://www- diglib.stanford. edu/testbed/doc2/SDLIP/.
8Andreas Paepcke, Robert Brandriff, etc, search middleware and the simple digital library interoperability protocol. D-Lib Magazine, March 2000.
