V. REVATHI; P. MAHESWARI NAIK. On Quasi-class (Q) Operator. International Journal of Mathematics And its Applications, [S. l.], v. 8, n. 2, p. 49–65, 2020. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/156. Acesso em: 6 may. 2024.