Masakatsu Ohta Toshiyuki Iida Tsukasa Kawaoka Opinion Transition Model Under Dynamic Environment: Experiment in Introducing Personality to Knowledge-Based Systems. 569-574 1995 IEA/AIE http://portal.acm.org/citation.cfm?id=215624.215840 db/conf/ieaaie/ieaaie1995.html#OhtaIK95