Graceful Labeling of Prime Index Graph of Group Zp × Zpn. Contemporary Mathematics , [S. l.], v. 4, n. 3, p. 612–619, 2023. DOI: 10.37256/cm.4320232727. Disponível em: https://ojs353.mebyme.cn/index.php/CM/article/view/2727. Acesso em: 24 dec. 2025.