Hussein, B. H. (2017) “Space Charge Effect for Design Electron Gun Using Five Electrode Immersion Electrostatic Lenses”, Ibn AL-Haitham Journal For Pure and Applied Sciences, 26(1), pp. 144–152. Available at: https://jih.uobaghdad.edu.iq/index.php/j/article/view/514 (Accessed: 22 November 2024).