Wei Liu Keng Soon Teh Roshan Lalintha Peiris Yongsoon Choi Adrian David Cheok Charissa Mei Ling Lim Yin Leng Theng Ta Huynh Duy Nguyen Tran Cong Thien Qui Athanasios V. Vasilakos Internet-Enabled User Interfaces for Distance Learning. 51-77 2009 5 IJTHI 1 http://dx.doi.org/10.4018/jthi.2009010105 db/journals/ijthi/ijthi5.html#LiuTPCCLTNQV09