ALI HAMED, S. M.; OSMAN, A. A. Design Formulas for Broadband Concentric Circular-Loops Antennas. Advanced Electromagnetics, [S. l.], v. 4, n. 1, p. 45–51, 2015. DOI: 10.7716/aem.v4i1.277. Disponível em: https://aemjournal.org/index.php/AEM/article/view/277. Acesso em: 13 dec. 2025.