G.S.AL-KHAFAJI, Dheia; N. SHEKOURY, Raymond. Combinatorial Realizability Of The New Exact Sequence. Journal of Al-Qadisiyah for Computer Science and Mathematics, [S. l.], v. 2, n. 2, p. 36–52, 2017. Disponível em: https://jqcsm.qu.edu.iq/index.php/journalcm/article/view/222. Acesso em: 20 sep. 2024.