ASTHANA, R.; VERMA, N. Classification of Encrypted Text and Encrypted Speech (Short Communication). Defence Science Journal, [S. l.], v. 60, n. 4, p. 420–422, 2010. DOI: 10.14429/dsj.60.497. Disponível em: https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/497. Acesso em: 15 jun. 2025.