MOHIADDIN, G. H.; SHARAF, K. R. Change of nullity of a graph under two operations. Kuwait Journal of Science, [S. l.], v. 48, n. 4, 2021. DOI: 10.48129/kjs.v48i4.9111. Disponível em: https://journals.ku.edu.kw/kjs/index.php/KJS/article/view/9111. Acesso em: 6 may. 2026.