Seidy, Essam EI, Salah ElDin Hussein, and Atef Abo Elkher. “Spectra of Some Operations on Graphs”. JOURNAL OF ADVANCES IN MATHEMATICS 11, no. 9 (January 8, 2016): 5654–5660. Accessed May 16, 2024. https://rajpub.com/index.php/jam/article/view/828.