1. Interoperability in personalized adaptive learning;Aroyo;Educational Technology and Society,2006
2. The OO jDREW reference implementation of RuleML;Ball,2005
3. BD (2000). Bologna declaration, . Available 18.01.09.
4. The semantic web;Berners-Lee;Scientific American,2001
5. Adjustable personalization of search and delivery of learning objects to learners;Biletskiy;Expert Systems with Applications,2008