Haruki Ueno Zheng He Jingxia Yue WebELS: A Content-Centered E-Learning Platform for Postgraduate Education in Engineering. 246-255 2009 HCI (4) http://dx.doi.org/10.1007/978-3-642-02583-9_28 conf/hci/2009-4 db/conf/hci/hci2009-4.html#UenoHY09