8Hunter J. MetaNet - a metadata term thesaurus to enable semantic interoperability between metadata domains [ EB/OL ]. [2007-03-15]. http: //jodi. ecs. soton. ac. uk/Articles/ v01/i08/Hunter/
9Smith T R, Zeng M L. Building semantic tools for concept-based learning spaces: knowledge bases of strongly-structured models for scientific concepts in advanced digital libraries [ EB/OL ]. [ 2007-05-18 ]. http : //jodi. tamu. edu/Articles/v04/i04/ Smith/
10Janee G, Frew J. The ADEPT digital library architecture [ C ] //Proceedings of the Second ACM/IEEE-CS Joint Conference on Digital Libraries (JCDL' 02 ), Portland, OR, July, 2002