Conceptual Modeling - ER 2002 21st International Conference on Conceptual Modeling Tampere, Finland, October 7-11, 2002 Proceedings - Spaccapietra, Stefano; Spaccapietra, Stefano; March, Salvatore; March, Salvatore; Kambayashi, Yahiko; Kambayashi, Yahiko (Springer Berlin Heidelberg : Imprint: Springer, 2003)