A. Al-Khashab, M., منى, A. I. Mostafah, عبدالله, I. I. Ismail, and عصام. “Design and Fabrication of the Single Polepiece Magnetic Electron Lens of Truncated Cone Polepiece Shape”. Al-Rafidain Engineering Journal (AREJ), vol. 19, no. 3, June 2011, pp. 49-54, doi:10.33899/rengj.2011.27018.