MAHDI, Mustafa M.; HASSAN, Fouad F.; MOHAMMED, Omar A. Measuring and analyzing the impact of spending on research and development on the economic growth for selected developed countries. Tikrit Journal of Administrative and Economic Sciences, [S. l.], v. 16, n. 52, 3, p. 431–442, 2020. DOI: 10.25130/tjaes.16.52.3.27. Disponível em: https://www.tjaes.org/ojs/index.php/tjaes/article/view/1848. Acesso em: 7 mar. 2026.