ZHU, J.- dong; ZHAO, Y.; TANG, J.; XU, J. Automatic recognition of radar signals based on time-frequency image shape character. Defence Science Journal, [S. l.], v. 63, n. 3, p. 308–314, 2013. DOI: 10.14429/dsj.63.2404. Disponível em: https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/2404. Acesso em: 17 aug. 2025.