CAEIRO, M.; FONTENLA, J.; LLAMAS, M. What are my students doing? Introducing ELENA, the E-Learning Event Notification Architecture. Cadernos de Informática, [S. l.], v. 6, n. 1, p. 171–178, 2011. Disponível em: https://seer.ufrgs.br/index.php/cadernosdeinformatica/article/view/v6n1p171-178. Acesso em: 24 jun. 2025.