Spectra of some Operations on Graphs. JOURNAL OF ADVANCES IN MATHEMATICS, [S. l.], v. 11, n. 9, p. 5654–5660, 2016. DOI: 10.24297/jam.v11i9.828. Disponível em: https://www.rajpub.com/index.php/jam/article/view/828. Acesso em: 19 jun. 2026.