HASAN, H. S. Air Gap Effect on the Properties of Unsaturated Symmitrical Double Polepiece Lenses. Ibn AL-Haitham Journal For Pure and Applied Sciences, Baghdad, Iraq., v. 21, n. 1, p. 49–61, 2017. Disponível em: https://jih.uobaghdad.edu.iq/index.php/j/article/view/1375. Acesso em: 15 mar. 2025.