Caeiro, M., Fontenla, J. e Llamas, M. (2011) “What are my students doing? Introducing ELENA, the E-Learning Event Notification Architecture”, Cadernos de Informática, 6(1), p. 171–178. Disponível em: https://seer.ufrgs.br/index.php/cadernosdeinformatica/article/view/v6n1p171-178 (Acesso em: 28 agosto 2026).