Dividing Graceful Labeling of Certain Tree Graphs. Tikrit Journal of Pure Science, [S. l.], v. 25, n. 4, p. 123–126, 2020. DOI: 10.25130/tjps.v25i4.281. Disponível em: https://www.tjpsj.org/index.php/tjps/article/view/281. Acesso em: 8 nov. 2026.