SAMBO, U. .; ADAMU, U. .; SULE, B. .; YAHAYA, M. A. . Progressive and Retrogressive Phenomena of Economic Activity in Africa. Journal of Asian Multicultural Research for Economy and Management Study, [S. l.], v. 1, n. 2, p. 7-18, 2020. DOI: 10.47616/jamrems.v1i2.42. Disponível em: https://amrsjournals.com/index.php/jamrems/article/view/42. Acesso em: 16 sep. 2026.