Ahmad, Uzma, and Saira Hameed. “Bounds of HOMO-LUMO Gap for Certain Nanotubes and Nanotori”. Journal of Informatics and Mathematical Sciences 10, no. 3 (September 30, 2018): 391–398. Accessed May 5, 2024. http://www.rgnpublications.com/journals/index.php/jims/article/view/807.