Sabeeh Mahmood, Ghassan, Taha Mohammed Hasan, and Aymen Mudheher Badr. 2017. “Multi-Authority System Based Personal Health Record in Cloud Computing”. Journal of Al-Qadisiyah for Computer Science and Mathematics 9 (1):108-16. https://jqcsm.qu.edu.iq/index.php/journalcm/article/view/20.