ABU HASSAN, Malik. Perluasan Kaedah Zubov Kepada Sistem Skalar Berubah Masa. MATEMATIKA, [S. l.], v. 7, p. 63–74, 1991. DOI: 10.11113/matematika.v7.n.462. Disponível em: https://matematika.utm.my/index.php/matematika/article/view/462. Acesso em: 5 may. 2024.