Conceptual Modeling – ER 2003 22nd International Conference on Conceptual Modeling, Chicago, IL, USA, October 13-16, 2003, Proceedings - Song, Il-Yeol; Song, Il-Yeol; Liddle, Stephen W.; Liddle, Stephen W.; Ling, Tok Wang; Ling, Tok Wang; Scheuermann, Peter; Scheuermann, Peter (Springer Berlin Heidelberg : Imprint: Springer, 2003)