Mohd Syazwan Abdullah Ian D. Benest Richard F. Paige Chris Kimble Using Unified Modeling Language for Conceptual Modelling of Knowledge-Based Systems. 438-453 2007 conf/er/2007 ER http://dx.doi.org/10.1007/978-3-540-75563-0_30 db/conf/er/er2007.html#AbdullahBPK07