BÖHLE, K.; RIEHM, U. E-petition systems and political participation: About institutional challenges and democratic opportunities. First Monday, [S. l.], v. 18, n. 7, 2013. DOI: 10.5210/fm.v18i7.4220. Disponível em: https://firstmonday.org/ojs/index.php/fm/article/view/4220. Acesso em: 8 dec. 2021.