HELLMAN, R. User Support: From Surface to Structure. DAIMI Report Series, [S. l.], v. 17, n. 263, 1988. DOI: 10.7146/dpb.v17i263.7617. Disponível em: https://tidsskrift.dk/daimipb/article/view/7617. Acesso em: 9 may. 2024.