Fidalgo, Robson N., Edson Alves, Sergio España, Jaelson Castro, and Oscar Pastor. “Metamodeling the Enhanced Entity-Relationship Model”. Journal of Information and Data Management 4, no. 3 (September 25, 2013): 406. Accessed October 5, 2024. https://journals-sol.sbc.org.br/index.php/jidm/article/view/1506.