ZHANG, W.; CHEN, Z. Design of Frequency Invariant Wideband Beamformer with Real and Symmetric FIR Filters. Defence Science Journal, [S. l.], v. 62, n. 4, p. 243–247, 2012. DOI: 10.14429/dsj.62.965. Disponível em: https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/965. Acesso em: 18 aug. 2025.