ARDEKANI, L. K.; DAVVAZ, B. Derivations of gamma (semi)hyperrings. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 8, p. 1011–1018, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1613. Acesso em: 5 dec. 2025.