Christine Parent Klaus-Dieter Schewe Veda C. Storey 26th International Conference on Conceptual Modeling (ER 2007). 577-578 2009 68 Data Knowl. Eng. 7 http://dx.doi.org/10.1016/j.datak.2009.02.003 db/journals/dke/dke68.html#ParentSS09