CHEN, K.-Y. ALGEBRAIC EQUIVALENCE OF QUASINORMAL OPERATORS. Tamkang Journal of Mathematics, [S. l.], v. 25, n. 1, p. 87–91, 1994. DOI: 10.5556/j.tkjm.25.1994.4429. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4429. Acesso em: 8 may. 2024.