Al Droubi, Huda Abd- Al Mohaimen, Abd Al Hadi Mostafa Soufan, and Emad Abdel- Raouf Badawi. 2019. “Analytical Studying of Positron Annihilation Equations”. Journal of Natural Sciences, Life and Applied Sciences 3 (4): 89-78. https://doi.org/10.26389/AJSRP.H040919.