AHMED , Ibrahim S.; EBRAHIM , Hassan H.; AL-FAYADH, Ali. γ– algebra of Sets and Some of its Properties. Iraqi Journal of Science, [S. l.], v. 63, n. 11, p. 4918–4927, 2022. DOI: 10.24996/ijs.2022.63.11.28. Disponível em: https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/5995.. Acesso em: 6 dec. 2025.