S. NAGARAJAN; G. KAYALVIZHI; G. PRIYADHARSINI. HF-index of Graph Operations and Y-index of Graphs Based on Four Operations Related to the Join of Graphs. Research Highlights in Mathematics and Computer Science Vol. 3, [S. l.], p. 61–77, 2022. DOI: 10.9734/bpi/rhmcs/v3/4919A. Disponível em: https://stm.bookpi.org/RHMCS-V3/article/view/8878. Acesso em: 12 jun. 2026.