Dayoub, Nazir. “Study of the Effect of Changing the Percentage of Germanium Affinity for Pure Silica on the Bending Coefficient of Physical Dissipation”. Tishreen University Journal -Basic Sciences Series 41, no. 2 (April 25, 2019). Accessed May 1, 2024. https://journal.tishreen.edu.sy/index.php/bassnc/article/view/8643.