Ugburo, Isreal, et al. “Designing PAYGO Business Models for Affordable Electric Mobility: A Techno-Economic Case Study of E-Bicycles in Windhoek, Namibia”. African Journal of Entrepreneurship, Innovation and Development Research, vol. 1, no. 1, Sept. 2026, pp. 114-33, https://journal.ajeidr.com/index.php/ajeidr/article/view/8.