Pedro J. Molina Jorge Belenguer Oscar Pastor Describing Just-UI Concepts Using a Task Notation. 218-230 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2844&spage=218 2003 conf/dsvis/2003 DSV-IS db/conf/dsvis/dsvis2003.html#MolinaBP03