MOHAMAD ZAIN, Shaharir. Makalah Jemputan/Invited Article: Sains Matematik dan Pengurusan. Journal of Quality Measurement and Analysis, [S. l.], v. 1, n. 1, p. 1–45, 2005. Disponível em: https://jqma.ukm.my/index.php/jqma/article/view/2. Acesso em: 6 dec. 2025.