RAMOS, M. A.; MASIERO, P. C.; PENTEADO, R. A.; BRAGA, R. T. Extending statecharts to model system interactions. Journal of Software Engineering Research and Development, [S. l.], v. 3, p. 12:1 – 12:25, 2015. Disponível em: https://sol.sbc.org.br/journals/index.php/jserd/article/view/410. Acesso em: 23 oct. 2021.