3 Mohammad Alrifai Peter Dolog Wolfgang Nejdl 2006 Learner Profile Management for Collaborative Adaptive eLearning Application APS'2006: Joint International Workshop on Adaptivity, Personalization and the Semantic Web at the 17th ACM Hypertext 2006 conference Odense, Denmark ACM Press aug 0-7695-2737-X http://doi.acm.org/10.1145/1149933.1149938