DIN, M.; PAL, S. K.; MUTTOO, S. K.; MADAN, S. A Hybrid Computational Intelligence based Technique for Automatic Cryptanalysis of Playfair Ciphers. Defence Science Journal, [S. l.], v. 70, n. 6, p. 612–618, 2020. DOI: 10.14429/dsj.70.15749. Disponível em: https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/15749. Acesso em: 15 jun. 2025.