HAS N, Fl. S. The Effect of Air Gap Width (S) and the Ratio (P1/D2) on .Minimum Projector Focal Length (Fp)min for the Double Pole-Piece Lens- at Costant Excitation (NI). Ibn AL-Haitham Journal For Pure and Applied Sciences, Baghdad, Iraq., v. 21, n. 3, p. 95–111, 2017. Disponível em: https://jih.uobaghdad.edu.iq/index.php/j/article/view/1412. Acesso em: 14 mar. 2025.