Szabó, Zoltán, and Vilmos Bilicki. “Access Control of EHR Records in a Heterogeneous Cloud Infrastructure”. Acta Cybernetica 25, no. 2 (December 7, 2021): 485-516. Accessed April 20, 2024. https://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/4207.