1Liu Longshan. Media Synchronization solutions for Web-based distance learning[M]. Beijing: Beijing University of Posts and Telecom Press,1998.
2Wookey Lee. Developing Multimedia Data Warehouse of Education On-Demand Systems[J]. IEEE TENCOON,1999:942-945.
3Takashi Yoshino, Takaya Yuizono, Yoji Nagasawa. Development and Application of a Distance Learning Support System Using Personal Computers via the Internet[J]. IEEE ,1999:395-402.
4Mary Jo Reiff. Teaching Multiple Audiences From a Distance[J]. IEEE Communication Jazz, 1999:219-224.
