CHAMKHA, Y.; KAMMOUN, M. On perturbation of Drazin invertible linear relations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 75, n. 2, p. 269–286, 2023. DOI: 10.37863/umzh.v75i2.6761. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/6761. Acesso em: 5 dec. 2025.