Alberto H. F. Laender Silvana Castano Umeshwar Dayal Fabio Casati José Palazzo Moreira de Oliveira Conceptual Modeling - ER 2009, 28th International Conference on Conceptual Modeling, Gramado, Brazil, November 9-12, 2009. Proceedings 5829 2009 http://dx.doi.org/10.1007/978-3-642-04840-1 978-3-642-04839-5 ER Lecture Notes in Computer Science Springer db/conf/er/er2009.html