J. FARHAN, Malik; A. ABED AL-HUSSEIN, Zaid; K., Sarab. Bandwidth Improvement of Microstrip Antenna Using Multi-Resonator Elements with Stacked Geometry. Journal of Engineering and Sustainable Development, Baghdad, Iraq, v. 13, n. 4, p. 86–105, 2009. Disponível em: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1519.. Acesso em: 6 may. 2025.