GLIB ATSHAN, Waggas. Department of Mathematics,Collage of Science,AL-Mustansiryah University,Baghdad,Iraq. Journal of Al-Qadisiyah for Computer Science and Mathematics, [S. l.], v. 3, n. 2, p. 222–229, 2017. Disponível em: https://jqcsm.qu.edu.iq/index.php/journalcm/article/view/291. Acesso em: 19 sep. 2024.