N. Fotiou, A. Machas, G. C. Polyzos, G. Xylomenos, "Access control as a service for the Cloud", Journal of Internet Serv

N. Fotiou, A. Machas, G. C. Polyzos, G. Xylomenos, "Access control as a service for the Cloud", Journal of Internet Services and Applications, no. 11, 2015