Witoń, Agnieszka. “Spatial Diversity in the Socio-Economic Development in Sub-Saharan Africa As Measured by a Composite Index”. Entrepreneurial Business and Economics Review 3, no. 1 (May 5, 2015): 75–85. Accessed April 23, 2024. https://eber.uek.krakow.pl/eber/article/view/70.