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2[4]Sir John Daniel and Others:The Role of E-learning in Building Knowledge -Based Societies in Developing Countries (2005) The 19th AAOU Annual Conference.
3[5]Gajaraj Dhanarajan:Sustaining Knowledge Societies Through Distance Learning:The Nature of the Challenge
4[6]Ulrich Bernath:Critical Issues of Online Distance Education and the Educational Reform.中国国际远程教育大会(2005).
