R. KHAN; A. KHAN; H. U. KHAN; F. M. KHAN. Uni-soft Filters of Ordered Semigroups. Sindh University Research Journal - SURJ (Science Series), [S. l.], v. 48, n. 4, 2016. Disponível em: https://sujo.usindh.edu.pk/index.php/SURJ/article/view/4796. Acesso em: 30 jul. 2026.