Structural and Spectral Properties of k-Quasi Class Q(N) and k-Quasi Class Q*(N) Operators. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 15, n. 4, p. 1836–1853, 2022. DOI: 10.29020/nybg.ejpam.v15i4.4580. Disponível em: https://ejpam.com/index.php/ejpam/article/view/4580.. Acesso em: 16 jul. 2024.