“Effect of the Gap Size Between the Cathode and the Wehnelt Cylinder Bore on the Emittance of the Thermionic Electron Gun”.
Iraqi Journal of Science 63, no. 8 (August 31, 2022): 3382–3389. Accessed August 8, 2025.
https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/4981.