NEDELCHEV, M.; KOLEV, A. Synthesis of Planar Filters Using Defected Ground Structure Miniaturized Hairpin Resonators. Engineering, Technology & Applied Science Research, Greece, v. 9, n. 1, p. 3734–3738, 2019. DOI: 10.48084/etasr.2424. Disponível em: https://etasr.com/index.php/ETASR/article/view/2424. Acesso em: 18 jul. 2024.