A. Al-Khashab, M., I. Mostafah, A., & I. Ismail, I. (2011). Design and Fabrication of the Single Polepiece Magnetic Electron Lens of Truncated Cone Polepiece Shape. Al-Rafidain Engineering Journal (AREJ), 19(3), 49–54. https://doi.org/10.33899/rengj.2011.27018