ACHARYA, M.; SINGH, T. Construction of Graceful Signed Graphs. Defence Science Journal, [S. l.], v. 56, n. 5, p. 801–808, 2006. DOI: 10.14429/dsj.56.1948. Disponível em: https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/1948. Acesso em: 16 jun. 2025.