R, S.; KUMAR, D. S. Spectral Continiuty : (p, k) - Quasihyponormal and Totally p-(a,b) normal operators. JOURNAL OF ADVANCES IN MATHEMATICS, [S. l.], v. 8, n. 3, p. 1586–1596, 2014. DOI: 10.24297/jam.v8i3.7264. Disponível em: https://rajpub.com/index.php/jam/article/view/7264. Acesso em: 22 jul. 2024.