Heejung Chang Kangsun Lee Applying Web Services and Design Patterns to Modeling and Simulating Real-World Systems. 351-359 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3397&spage=351 2004 conf/ais/2004 AIS db/conf/ais/ais2004.html#ChangL04