Kinh Nguyen Tharam S. Dillon Atomic Use Case: A Concept for Precise Modelling of Object-Oriented Information Systems. 400-411 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2817&spage=400 2003 conf/oois/2003 OOIS db/conf/oois/oois2003.html#NguyenD03