4[1]William Y Arms, Diane Hillmann, Carl Lagoze, et al. A Spectrum of Interoperability [ J/OL]. http://www. dlib. org/dlib/janua/ry02/arms/01 arms. html, 2001.
5[2]Carl Lagoze, Herbert Van de Sompel. The Open Archives Initiative: Building a Low- barrier Interoperability Framework [ J/OL] .http://www. openarchives. org/documents/oai. pdf,2001.
6[3]Clifford A Lynch. Metadata Harvesting and the Open Archives Initiative [ EB/OL ] . http://www. arl. org/newsltr/217/mhp.html,2001-08.
7[4]Cal Lagoze, Walter Hoehn, David Millman. Core Services in the Architecture of the National Digital Library for Science Education ( NSDL ) [ J/OL ] .http://arxiv. org/ftp/cs/papers/0201/0201025. pdf, 2001.
8ALA Committee on Cataloging: Description and Access Task Force on Metadata and the Cataloging Rules Final Report[EB/OL]. August 21,1998. http://www. ala.org/alcts/organization/ccs/ccda.