MARENZI, Ivana; DEMIDOVA, Elena; NEJDL, Wolfgang; OLMEDILLA, Daniel; ZERR, Sergej. Social Software for Lifelong Competence Development: Challenges and Infrastructure. International Journal of Emerging Technologies in Learning (iJET), [S. l.], v. 3, n. s1, p. pp. 18–23, 2008. Disponível em: https://online-journals.org/index.php/i-jet/article/view/545. Acesso em: 20 may. 2026.