PIECHOTTA, C.; JENSEN, A. E.; OLSEN, M. G. Secure Dynamic Cloud-based Collaboration with Hierarchical Access. Technical Report Electronics and Computer Engineering, [S. l.], v. 1, n. 8, 2012. Disponível em: https://tidsskrift.dk/ece/article/view/21223. Acesso em: 28 apr. 2024.