1. Abera M, Ahmedin N, Muluneh B (2022) Urban sprawl or urban development? Peri-urbanism in metropolitan areas of Amhara Region, Ethiopia. Afr Stud Q 21(1)
2. Africapolis Data (2015) Africapolis database, 2015 Data. Accessed 28 Feb 2023
3. Africapolis Data (2020) Africapolis database 2020. Accessed 28 Feb 2023
4. Alkhedheiri AA (1998) The role of secondary cities in the national development process of Saudi Arabia. University of London, University College London, London
5. Alm J (2015) Financing urban infrastructure: knowns, unknowns, and a way forward. J Econ Surv 29(2):230–262