Magic square. Baghdad Science Journal, Iraq, Baghdad, v. 6, n. 3, p. 618–620, 2009. DOI: 10.21123/bsj.2009.6.3.618-620. Disponível em: https://bsj-ojs.uobaghdad.edu.iq/index.php/BSJ/article/view/1024.. Acesso em: 15 jul. 2025.