WANJALA VICTOR; A. M. NYONGESA. On Class $ (Q^{*})$. International Journal of Mathematics And its Applications, [S. l.], v. 9, n. 2, p. 227–230, 2021. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/90. Acesso em: 3 may. 2024.