PIECHOTTA, Chris; JENSEN, Adam Enø; OLSEN, Martin Grooss. Secure Dynamic Cloud-based Collaboration with Hierarchical Access. Technical Report Electronics and Computer Engineering, [S. l.], v. 1, n. 8, 2012. DOI: 10.7146/ece.v1i8.21223. Disponível em: https://tidsskrift.dk/ece/article/view/21223. Acesso em: 5 dec. 2025.