LEE, S. P.; ROLLAND, C. Abstraction in an Object-Oriented Analysis Method. Malaysian Journal of Computer Science, [S. l.], v. 10, n. 1, p. 53–63, 1997. Disponível em: https://ijie.um.edu.my/index.php/MJCS/article/view/3016. Acesso em: 18 apr. 2025.