1 2 Butterfield, R.E; Coll Besa, M; Burmeister, H; Blair, K; Kavonic, J; Bharwani, S; Cullis, J; Spires, M; Mwalukanga, B (2017). "Inspiring Climate Action in African Cities: Practical Options for Resilient Pathways" (PDF). fractal.org.za. Retrieved 25 November 2020. ↑ Förster, Till; Ammann, Carole (1 October 2018).