“Improvement the Action Efficiency of Microwave Vacuum Tube Type GI-19B by Activation its Intersurfaces”, IHJPAS, vol. 21, no. 2, pp. 36–44, Sep. 2017, Accessed: May 20, 2024. [Online]. Available: https://jih.uobaghdad.edu.iq/index.php/j/article/view/1347