S. A. HUJAZIE, N. Investigation of the Focal and Zoom Properties for Three-Element Cylindrical Electrostatic Lens. Rafidain Journal of Science, [S. l.], v. 21, n. 6, p. 40–51, 2010. DOI: 10.33899/rjs.2010.37154. Disponível em: https://jwups.uomosul.edu.iq/index.php/rsci/article/view/47711. Acesso em: 29 sep. 2025.