1[1]Learning Technology Systems Architecture. IEEE org, 1998-05-21
2[2]Vouk M A, Bitzer D L, Klevans R L.Workflow and End-user Quality of Service Issues in Web-based Education. IEEE Transactions on Knowledge and Data Engineering,1999, 11(4):357
3[3]IEEE LTSC. Draft Standard for Computer-managed Instruction.1999
4[4]IEEE LTSC. Learning Object Metadata Working Draft Document 3.Approved, 1999-11-27
9Tamburini, Fabio. A multimedia framework for second lan guage teaching in self-access environments[J]. Computers &Education, 1999, 32(2): 137-149.
