Akio Koyama Leonard Barolli Zixue Cheng Norio Shiratori An Agent-Based Personalized Distance Learning System for Delivering Appropriate Studying Materials to Learners. 3-16 2002 conf/icoin/2002-1 ICOIN (1) http://link.springer.de/link/service/series/0558/bibs/2343/23430003.htm db/conf/icoin/icoin2002-1.html#KoyamaBCS02