Kulli, V. R. “Delta F, Modified Delta Sombor and Delta Sigma Indices of Certain Nanotubes and Networks”. International Journal Of Mathematics And Computer Research 11, no. 10 (October 19, 2023): 3813-3820. Accessed October 23, 2026. https://mail.ijmcr.in/index.php/ijmcr/article/view/651.