"Study of Radon Concentrations in Some of Public Ground Water Wells, Sana’a - Yemen". Hadhramout University Journal of Natural & Applied Sciences 20, no. 1 (نوفمبر 29, 2023). تاريخ الوصول يوليو 25, 2026. https://hu.edu.ye/hu-publications/journals/index.php/hujnas/article/view/149.