ČERIN, Z. Regular Heptagon’s Midpoints Circle. Sarajevo Journal of Mathematics, [S. l.], v. 2, n. 1, p. 119–131, 2024. DOI: 10.5644/SJM.02.1.13. Disponível em: https://sjm.anubih.ba/index.php/sjm/article/view/435. Acesso em: 15 oct. 2024.