EL-ROUBY, M. Mechanism of Change in Demographic Ageing. دراسات في الاقتصاد والتجارة , [S. l.], v. 17, n. 2, 1981. DOI: 10.37376/deb.v17i2.1937. Disponível em: https://journals.uob.edu.ly/DEB/article/view/1937. Acesso em: 25 2025.